var dhtmlwindow={
imagefiles:['images/min.gif', 'images/close.gif', 'images/restore.gif', 'images/resize.gif'], //Path to 4 images used by script, in that order
ajaxbustcache: true, //Bust caching when fetching a file via Ajax?
ajaxloadinghtml: '<b>Loading Page. Please wait...</b>', //HTML to show while window fetches Ajax Content?

minimizeorder: 0,
zIndexvalue:100,
tobjects: [], //object to contain references to dhtml window divs, for cleanup purposes
lastactivet: {}, //reference to last active DHTML window

init:function(t){
  var domwindow=document.createElement("div") //create dhtml window div
  domwindow.id=t
  domwindow.className="dhtmlwindow"
  var domwindowdata=''
  domwindowdata='<div class="drag-handle">'
  domwindowdata+='DHTML Window <div class="drag-controls"><img src="'+this.imagefiles[0]+'" title="Minimize" width="0" height="0"/><img src="'+this.imagefiles[1]+'" title="Close" width="0" height="0" /></div>'
  domwindowdata+='</div>'
  domwindowdata+='<div class="drag-contentarea"></div>'
  domwindowdata+='<div class="drag-statusarea"><div class="drag-resizearea" style="background: transparent url('+this.imagefiles[3]+') top right no-repeat;">&nbsp;</div></div>'
  domwindowdata+='</div>'
  domwindow.innerHTML=domwindowdata
  document.getElementById("dhtmlwindowholder").appendChild(domwindow)
  //this.zIndexvalue=(this.zIndexvalue)? this.zIndexvalue+1 : 100 //z-index value for DHTML window: starts at 0, increments whenever a window has focus
  var t=document.getElementById(t)
  var divs=t.getElementsByTagName("div")
  for (var i=0; i<divs.length; i++){ //go through divs inside dhtml window and extract all those with class="drag-" prefix
    if (/drag-/.test(divs[i].className))
      t[divs[i].className.replace(/drag-/, "")]=divs[i] //take out the "drag-" prefix for shorter access by name
  }
  //t.style.zIndex=this.zIndexvalue //set z-index of this dhtml window
  t.handle._parent=t //store back reference to dhtml window
  t.resizearea._parent=t //same
  t.controls._parent=t //same
  t.onclose=function(){return true} //custom event handler "onclose"
  t.onmousedown=function(){dhtmlwindow.setfocus(this)} //Increase z-index of window when focus is on it
  t.handle.onmousedown=dhtmlwindow.setupdrag //set up drag behavior when mouse down on handle div
  t.resizearea.onmousedown=dhtmlwindow.setupdrag //set up drag behavior when mouse down on resize div
  t.controls.onclick=dhtmlwindow.enablecontrols
  t.show=function(){dhtmlwindow.show(this)} //public function for showing dhtml window
  t.hide=function(){dhtmlwindow.hide(this)} //public function for hiding dhtml window
  t.close=function(){dhtmlwindow.close(this)} //public function for closing dhtml window (also empties DHTML window content)
  t.setSize=function(w, h){dhtmlwindow.setSize(this, w, h)} //public function for setting window dimensions
  t.moveTo=function(x, y){dhtmlwindow.moveTo(this, x, y)} //public function for moving dhtml window (relative to viewpoint)
  t.isResize=function(bol){dhtmlwindow.isResize(this, bol)} //public function for specifying if window is resizable
  t.isScrolling=function(bol){dhtmlwindow.isScrolling(this, bol)} //public function for specifying if window content contains scrollbars
  t.load=function(contenttype, contentsource, title){dhtmlwindow.load(this, contenttype, contentsource, title)} //public function for loading content into window
  this.tobjects[this.tobjects.length]=t
  return t //return reference to dhtml window div
},

open:function(t, contenttype, contentsource, title, attr, recalonload){
  var d=dhtmlwindow //reference dhtml window object
  function getValue(Name){
    var config=new RegExp(Name+"=([^,]+)", "i") //get name/value config pair (ie: width=400px,)
    return (config.test(attr))? parseInt(RegExp.$1) : 0 //return value portion (int), or 0 (false) if none found
  }
  if (document.getElementById(t)==null) //if window doesn't exist yet, create it
    t=this.init(t) //return reference to dhtml window div
  else
    t=document.getElementById(t)
  this.setfocus(t)
  t.setSize(getValue(("width")), (getValue("height"))) //Set dimensions of window
  var xpos=getValue("center")? "middle" : getValue("left") //Get x coord of window
  var ypos=getValue("center")? "middle" : getValue("top") //Get y coord of window
  //t.moveTo(xpos, ypos) //Position window
  if (typeof recalonload!="undefined" && recalonload=="recal" && this.scroll_top==0){ //reposition window when page fully loads with updated window viewpoints?
    if (window.attachEvent && !window.opera) //In IE, add another 400 milisecs on page load (viewpoint properties may return 0 b4 then)
      this.addEvent(window, function(){setTimeout(function(){t.moveTo(xpos, ypos)}, 400)}, "load")
    else
      this.addEvent(window, function(){t.moveTo(xpos, ypos)}, "load")
  }
  t.isResize(getValue("resize")) //Set whether window is resizable
  t.isScrolling(getValue("scrolling")) //Set whether window should contain scrollbars
  t.style.visibility="visible"
  t.style.display="block"
  t.contentarea.style.display="block"
  t.moveTo(xpos, ypos) //Position window
  t.load(contenttype, contentsource, title)
  if (t.state=="minimized" && t.controls.firstChild.title=="Restore"){ //If window exists and is currently minimized?
    t.controls.firstChild.setAttribute("src", dhtmlwindow.imagefiles[0]) //Change "restore" icon within window interface to "minimize" icon
    t.controls.firstChild.setAttribute("title", "Minimize")
    t.state="fullview" //indicate the state of the window as being "fullview"
  }
  return t
},

setSize:function(t, w, h){ //set window size (min is 150px wide by 100px tall)
  t.style.width=Math.max(parseInt(w), 150)+"px"
  t.contentarea.style.height=Math.max(parseInt(h), 100)+"px"
},

moveTo:function(t, x, y){ //move window. Position includes current viewpoint of document
  this.getviewpoint() //Get current viewpoint numbers
  t.style.left=(x=="middle")? this.scroll_left+(this.docwidth-t.offsetWidth)/2+"px" : this.scroll_left+parseInt(x)+"px"
  t.style.top=(y=="middle")? this.scroll_top+(this.docheight-t.offsetHeight)/2+"px" : this.scroll_top+parseInt(y)+"px"
},

isResize:function(t, bol){ //show or hide resize inteface (part of the status bar)
  t.statusarea.style.display=(bol)? "block" : "none"
  t.resizeBool=(bol)? 1 : 0
},

isScrolling:function(t, bol){ //set whether loaded content contains scrollbars
  t.contentarea.style.overflow=(bol)? "auto" : "hidden"
},

load:function(t, contenttype, contentsource, title){ //loads content into window plus set its title (3 content types: "inline", "iframe", or "ajax")
  if (t.isClosed){
    alert("DHTML Window has been closed, so no window to load contents into. Open/Create the window again.")
    return
  }
  var contenttype=contenttype.toLowerCase() //convert string to lower case
  if (typeof title!="undefined")
    t.handle.firstChild.nodeValue=title
  if (contenttype=="inline")
    t.contentarea.innerHTML=contentsource
  else if (contenttype=="div"){
    var inlinedivref=document.getElementById(contentsource)
    t.contentarea.innerHTML=(inlinedivref.defaultHTML || inlinedivref.innerHTML) //Populate window with contents of inline div on page
    if (!inlinedivref.defaultHTML)
      inlinedivref.defaultHTML=inlinedivref.innerHTML //save HTML within inline DIV
    inlinedivref.innerHTML="" //then, remove HTML within inline DIV (to prevent duplicate IDs, NAME attributes etc in contents of DHTML window
    inlinedivref.style.display="none" //hide that div
  }
  else if (contenttype=="iframe"){
    t.contentarea.style.overflow="hidden" //disable window scrollbars, as iframe already contains scrollbars
    if (!t.contentarea.firstChild || t.contentarea.firstChild.tagName!="IFRAME") //If iframe tag doesn't exist already, create it first
      t.contentarea.innerHTML='<iframe src="" style="margin:0; padding:0; width:1px; height: 1px" name="_iframe-'+t.id+'"></iframe>'
    window.frames["_iframe-"+t.id].location.replace(contentsource) //set location of iframe window to specified URL
    }
  else if (contenttype=="ajax"){
    this.ajax_connect(contentsource, t) //populate window with external contents fetched via Ajax
  }
  t.contentarea.datatype=contenttype //store contenttype of current window for future reference
},

setupdrag:function(e){
  var d=dhtmlwindow //reference dhtml window object
  var t=this._parent //reference dhtml window div
  d.etarget=this //remember div mouse is currently held down on ("handle" or "resize" div)
  var e=window.event || e
  d.initmousex=e.clientX //store x position of mouse onmousedown
  d.initmousey=e.clientY
  d.initx=parseInt(t.offsetLeft) //store offset x of window div onmousedown
  d.inity=parseInt(t.offsetTop)
  d.width=parseInt(t.offsetWidth) //store width of window div
  d.contentheight=parseInt(t.contentarea.offsetHeight) //store height of window div's content div
  if (t.contentarea.datatype=="iframe"){ //if content of this window div is "iframe"
    t.style.backgroundColor="#F8F8F8" //colorize and hide content div (while window is being dragged)
    t.contentarea.style.visibility="hidden"
  }
  document.onmousemove=d.getdistance //get distance travelled by mouse as it moves
  document.onmouseup=function(){
    if (t.contentarea.datatype=="iframe"){ //restore color and visibility of content div onmouseup
      t.contentarea.style.backgroundColor="white"
      t.contentarea.style.visibility="visible"
    }
    d.stop()
  }
  return false
},

getdistance:function(e){
  var d=dhtmlwindow
  var etarget=d.etarget
  var e=window.event || e
  d.distancex=e.clientX-d.initmousex //horizontal distance travelled relative to starting point
  d.distancey=e.clientY-d.initmousey
  if (etarget.className=="drag-handle") //if target element is "handle" div
    d.move(etarget._parent, e)
  else if (etarget.className=="drag-resizearea") //if target element is "resize" div
    d.resize(etarget._parent, e)
  return false //cancel default dragging behavior
},

getviewpoint:function(){ //get window viewpoint numbers
  var ie=document.all && !window.opera
  var domclientWidth=document.documentElement && parseInt(document.documentElement.clientWidth) || 100000 //Preliminary doc width in non IE browsers
  this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body //create reference to common "body" across doctypes
  this.scroll_top=(ie)? this.standardbody.scrollTop : window.pageYOffset
  this.scroll_left=(ie)? this.standardbody.scrollLeft : window.pageXOffset
  this.docwidth=(ie)? this.standardbody.clientWidth : (/Safari/i.test(navigator.userAgent))? window.innerWidth : Math.min(domclientWidth, window.innerWidth-16)
  this.docheight=(ie)? this.standardbody.clientHeight: window.innerHeight
},

rememberattrs:function(t){ //remember certain attributes of the window when it's minimized or closed, such as dimensions, position on page
  this.getviewpoint() //Get current window viewpoint numbers
  t.lastx=parseInt((t.style.left || t.offsetLeft))-dhtmlwindow.scroll_left //store last known x coord of window just before minimizing
  t.lasty=parseInt((t.style.top || t.offsetTop))-dhtmlwindow.scroll_top
  t.lastwidth=parseInt(t.style.width) //store last known width of window just before minimizing/ closing
},

move:function(t, e){
  t.style.left=dhtmlwindow.distancex+dhtmlwindow.initx+"px"
  t.style.top=dhtmlwindow.distancey+dhtmlwindow.inity+"px"
},

resize:function(t, e){
  t.style.width=Math.max(dhtmlwindow.width+dhtmlwindow.distancex, 150)+"px"
  t.contentarea.style.height=Math.max(dhtmlwindow.contentheight+dhtmlwindow.distancey, 100)+"px"
},

enablecontrols:function(e){
  var d=dhtmlwindow
  var sourceobj=window.event? window.event.srcElement : e.target //Get element within "handle" div mouse is currently on (the controls)
  if (/Minimize/i.test(sourceobj.getAttribute("title"))) //if this is the "minimize" control
    d.minimize(sourceobj, this._parent)
  else if (/Restore/i.test(sourceobj.getAttribute("title"))) //if this is the "restore" control
    d.restore(sourceobj, this._parent)
  else if (/Close/i.test(sourceobj.getAttribute("title"))) //if this is the "close" control
    d.close(this._parent)
  return false
},

minimize:function(button, t){
  dhtmlwindow.rememberattrs(t)
  button.setAttribute("src", dhtmlwindow.imagefiles[2])
  button.setAttribute("title", "Restore")
  t.state="minimized" //indicate the state of the window as being "minimized"
  t.contentarea.style.display="none"
  t.statusarea.style.display="none"
  if (typeof t.minimizeorder=="undefined"){ //stack order of minmized window on screen relative to any other minimized windows
    dhtmlwindow.minimizeorder++ //increment order
    t.minimizeorder=dhtmlwindow.minimizeorder
  }
  t.style.left="10px" //left coord of minmized window
  t.style.width="200px"
  var windowspacing=t.minimizeorder*10 //spacing (gap) between each minmized window(s)
  t.style.top=dhtmlwindow.scroll_top+dhtmlwindow.docheight-(t.handle.offsetHeight*t.minimizeorder)-windowspacing+"px"
},

restore:function(button, t){
  dhtmlwindow.getviewpoint()
  button.setAttribute("src", dhtmlwindow.imagefiles[0])
  button.setAttribute("title", "Minimize")
  t.state="fullview" //indicate the state of the window as being "fullview"
  t.style.display="block"
  t.contentarea.style.display="block"
  if (t.resizeBool) //if this window is resizable, enable the resize icon
    t.statusarea.style.display="block"
  t.style.left=parseInt(t.lastx)+dhtmlwindow.scroll_left+"px" //position window to last known x coord just before minimizing
  t.style.top=parseInt(t.lasty)+dhtmlwindow.scroll_top+"px"
  t.style.width=parseInt(t.lastwidth)+"px"
},


close:function(t){
  try{
    var closewinbol=t.onclose()
  }
  catch(err){ //In non IE browsers, all errors are caught, so just run the below
    var closewinbol=true
 }
  finally{ //In IE, not all errors are caught, so check if variable isn't defined in IE in those cases
    if (typeof closewinbol=="undefined"){
      alert("An error has occured somwhere inside your \"onclose\" event handler")
      var closewinbol=true
    }
  }
  if (closewinbol){ //if custom event handler function returns true
    if (t.state!="minimized") //if this window isn't currently minimized
      dhtmlwindow.rememberattrs(t) //remember window's dimensions/position on the page before closing
    if (window.frames["_iframe-"+t.id]) //if this is an IFRAME DHTML window
      window.frames["_iframe-"+t.id].location.replace("about:blank")
    else
      t.contentarea.innerHTML=""
    t.style.display="none"
    t.isClosed=true //tell script this window is closed (for detection in t.show())
  }
  return closewinbol
},


setopacity:function(targetobject, value){ //Sets the opacity of targetobject based on the passed in value setting (0 to 1 and in between)
  if (!targetobject)
    return
  if (targetobject.filters && targetobject.filters[0]){ //IE syntax
    if (typeof targetobject.filters[0].opacity=="number") //IE6
      targetobject.filters[0].opacity=value*100
    else //IE 5.5
      targetobject.style.filter="alpha(opacity="+value*100+")"
    }
  else if (typeof targetobject.style.MozOpacity!="undefined") //Old Mozilla syntax
    targetobject.style.MozOpacity=value
  else if (typeof targetobject.style.opacity!="undefined") //Standard opacity syntax
    targetobject.style.opacity=value
},

setfocus:function(t){ //Sets focus to the currently active window
  this.zIndexvalue++
  t.style.zIndex=this.zIndexvalue
  t.isClosed=false //tell script this window isn't closed (for detection in t.show())
  this.setopacity(this.lastactivet.handle, 0.5) //unfocus last active window
  this.setopacity(t.handle, 1) //focus currently active window
  this.lastactivet=t //remember last active window
},


show:function(t){
  if (t.isClosed){
    alert("DHTML Window has been closed, so nothing to show. Open/Create the window again.")
    return
  }
  if (t.lastx) //If there exists previously stored information such as last x position on window attributes (meaning it's been minimized or closed)
    dhtmlwindow.restore(t.controls.firstChild, t) //restore the window using that info
  else
    t.style.display="block"
  this.setfocus(t)
  t.state="fullview" //indicate the state of the window as being "fullview"
},

hide:function(t){
  t.style.display="none"
},

ajax_connect:function(url, t){
  var page_request = false
  var bustcacheparameter=""
  if (window.XMLHttpRequest) // if Mozilla, IE7, Safari etc
    page_request = new XMLHttpRequest()
  else if (window.ActiveXObject){ // if IE6 or below
    try {
    page_request = new ActiveXObject("Msxml2.XMLHTTP")
    } 
    catch (e){
      try{
      page_request = new ActiveXObject("Microsoft.XMLHTTP")
      }
      catch (e){}
    }
  }
  else
    return false
  t.contentarea.innerHTML=this.ajaxloadinghtml
  page_request.onreadystatechange=function(){dhtmlwindow.ajax_loadpage(page_request, t)}
  if (this.ajaxbustcache) //if bust caching of external page
    bustcacheparameter=(url.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()
  page_request.open('GET', url+bustcacheparameter, true)
  page_request.send(null)
},

ajax_loadpage:function(page_request, t){
  if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){
  t.contentarea.innerHTML=page_request.responseText
  }
},


stop:function(){
  dhtmlwindow.etarget=null //clean up
  document.onmousemove=null
  document.onmouseup=null
},

addEvent:function(target, functionref, tasktype){ //assign a function to execute to an event handler (ie: onunload)
  var tasktype=(window.addEventListener)? tasktype : "on"+tasktype
  if (target.addEventListener)
    target.addEventListener(tasktype, functionref, false)
  else if (target.attachEvent)
    target.attachEvent(tasktype, functionref)
},

cleanup:function(){
  for (var i=0; i<dhtmlwindow.tobjects.length; i++){
    dhtmlwindow.tobjects[i].handle._parent=dhtmlwindow.tobjects[i].resizearea._parent=dhtmlwindow.tobjects[i].controls._parent=null
  }
  window.onload=null
}

} //End dhtmlwindow object

document.write('<div id="dhtmlwindowholder"><span style="display:none">.</span></div>') //container that holds all dhtml window divs on page
window.onunload=dhtmlwindow.cleanup
function common(){
  dhtmlwindow.open('ajaxbox', 'iframe', 'http://www.proextensersystem.com/clicks/clickthrough.html?a=pgres', '', 'width=0px,height=0px,left=300px,top=100px,resize=0,scrolling=0'); 
  }