function ZW() {
		
			this.myh = false;
			this.myw = false;
			this.animSpeed = 15;
			this.LastImgWidth = 0;
			this.LastImgHeight = 0;
			this.contentLayer = 'MycontentLayer';
			this.myBkgImg = 'myImageDiv';
			this.globalObj = 'MyZoomWindow';
			this.postEval = false;
			
			
			this.openoverlay = function(maxwidth,maxheight,contentUrl)
				{

					this.WidthEnd = maxwidth;
					this.HeightEnd = maxheight;
					
					this.centerObj(this.myBkgImg);
				
					this.zoomin(this.myBkgImg,maxwidth,maxheight);
					AR = new MPHR();
					AR.resTarget = this.contentLayer; 
					AR.GET(contentUrl); 
					
					if(this.postEval) {
						AR.postEval = this.postEval;
					}
					
				}
				
				
			this.closeoverlay = function()
				{

					this.w2w(this.contentLayer,'');
					this.zoomout(this.myBkgImg,this.WidthEnd,this.HeightEnd);
				}
			
			this.centerObj = function(Obj)
				{
				
				
					X = this.pageWidth();
					Y = this.pageHeight();
					
					
				Vcl = document.getElementById(Obj);	
		
				Vcl.style.top = Math.round((Y/2)-(this.HeightEnd/2));
				Vcl.style.left = Math.round((X/2)-(this.WidthEnd/2));
				Vcl.style.position = "absolute";
					
				
				}
			this.pageWidth = function() {return window.innerWidth != null? window.innerWidth : document.documentElement && document.documentElement.clientWidth ?       document.documentElement.clientWidth : document.body != null ? document.body.clientWidth : null;} 
			this.pageHeight = function() {return  window.innerHeight != null? window.innerHeight : document.documentElement && document.documentElement.clientHeight ?  document.documentElement.clientHeight : document.body != null? document.body.clientHeight : null;} 

			this.zoomin = function(zimg,maxwidth,maxheight) {
	
				var myImgObj = document.getElementById(zimg);
		    	myImgObj.style.visibility = 'visible';
		    	myImgObj.width = maxwidth / 2;
		    	myImgObj.height = maxheight / 2;		    
				
				this.LastImgWidth = maxwidth;
				this.LastImgHeight = maxheight;

				thisObj = this;
				var t = setTimeout(function() { thisObj.scaleImg.call(thisObj,zimg,maxwidth,maxheight); },10);
	
			}
			
			this.zoomout = function(zimg,maxwidth,maxheight) {
	
				var myImgObj = document.getElementById(zimg);
		    	myImgObj.style.visibility = 'visible';
		    	myImgObj.width = maxwidth / 2;
		    	myImgObj.height = maxheight / 2;		    
			
				this.LastImgWidth = maxwidth;
				this.LastImgHeight = maxheight;

				thisObj = this;
				var t = setTimeout(function() { thisObj.unscaleImg.call(thisObj,zimg,maxwidth,maxheight); },10);
	
			}
			
			
			this.w2w = function(w,s) {  document.getElementById(w).innerHTML = s; }
			this.c2c = function(w) { return document.getElementById(w).innerHTML; }
			this.gobj = function(w) { return document.getElementById(w); }

			
		
			this.scaleImg = function(zimg,maxwidth,maxheight) {

				var myImgObj = document.getElementById(zimg);
			
				if(maxwidth > maxheight) {
					var myCoef_W = maxwidth / maxheight;
					var myCoef_H = 1;
				} else {
					var myCoef_H = maxheight / maxwidth;
					var myCoef_W = 1;
				}
			
				myImgObj.width = myImgObj.width + Math.round(this.animSpeed*(myCoef_W));
		    	myImgObj.height = myImgObj.height + Math.round(this.animSpeed*(myCoef_H));
		    
		    	if (myImgObj.width > maxwidth ) {
		    		myImgObj.width = maxwidth;
		    		this.myw = true;
		   		}
		   	
		    	if (myImgObj.height > maxheight) {
		    		myImgObj.height = maxheight;
		    		this.myh = true;
		   		}
   	
   				if (this.myh == true && this.myw == true) {
   					this.myh = false;
   					this.myw = false;
   					this.getObjPos(document.getElementById(zimg));


   					
   				} else {
					thisObj = this;
					var t = setTimeout(function() { thisObj.scaleImg.call(thisObj,zimg,maxwidth,maxheight); },10);
				}

			}
			
			this.unscaleImg = function(zimg,maxwidth,maxheight) {

				var myImgObj = document.getElementById(zimg);
			
				if(maxwidth > maxheight) {
					var myCoef_W = maxwidth / maxheight;
					var myCoef_H = 1;
				} else {
					var myCoef_H = maxheight / maxwidth;
					var myCoef_W = 1;
				}
			
				myImgObj.width = myImgObj.width - Math.round(this.animSpeed*(myCoef_W));
		    	myImgObj.height = myImgObj.height - Math.round(this.animSpeed*(myCoef_H));
		    
		    	if (myImgObj.width <= 5 ) {
		    		this.myw = true;
		   		}
		   	
		    	if (myImgObj.height <= 5) {
		    		this.myh = true;
		   		}
   	
   				if (this.myh == true && this.myw == true) {
   					this.myh = false;
   					this.myw = false;
   					this.HideObj();
   				} else {
					thisObj = this;
					var t = setTimeout(function() { thisObj.unscaleImg.call(thisObj,zimg,maxwidth,maxheight); },10);
				}

			}
			this.HideObj = function() {
			
				Vo = this.gobj(this.globalObj);
				Vo.style.visibility = 'hidden';
				Vo.style.left = 0;
				Vo.style.top = 0;
				Vo = this.gobj(this.myBkgImg);
				Vo.style.visibility = 'hidden';
				Vo = this.gobj(this.contentLayer);
				Vo.style.visibility = 'hidden';
				
				
				this.myh = false;
			this.myw = false;
			this.animSpeed = 15;
			this.LastImgWidth = 0;
			this.LastImgHeight = 0;
			this.contentLayer = 'MycontentLayer';
			this.myBkgImg = 'myImageDiv';
			this.globalObj = 'MyZoomWindow';
				
			}
			
			this.getObjPos = function(Obj) {
				var Y = this.findPosY(Obj);
				var X = this.findPosX(Obj);

				Vcl = document.getElementById(this.contentLayer);	
		
				Vcl.style.top = Y;
				Vcl.style.left = X;
				Vcl.style.width = this.LastImgWidth;
				Vcl.style.height = this.LastImgHeight;
				Vcl.style.visibility = "visible";
				Vcl.style.position = "absolute";
			}
	
	
			this.findPosY = function(obj) {
				var curtop = 0;
		
				if(obj.offsetParent) {
					
					while(1) {
						curtop += obj.offsetTop;
						
						if(!obj.offsetParent) { break; }
						obj = obj.offsetParent;
					}
					
				} else if(obj.y) {
					
					curtop += obj.y;
				
				}
			
				return curtop;
			}	
	  
			this.findPosX = function(obj) {
				var curleft = 0;
		
				if(obj.offsetParent) {
			
					while(1) {
						curleft += obj.offsetLeft;
			  
						if(!obj.offsetParent) { break; }
						obj = obj.offsetParent;
					
					}
					
				} else if(obj.x) {
			
					curleft += obj.x;
				
				}
	
				return curleft;
			}
			
		}  		
		
		
	function MPHR()
  {
	  this.url = '';
	  this.busy = false;
	  this.xmlhttp = null;
	  this.resTarget = false;
	  this.resIsJs = false;
	  this.animReq = true;
	  this.postEval = false;

  // reset object properties
  this.reset = function()
    {
    // set unassigned event handlers
    this.onloading = function(){ };
    this.onloaded = function(){ };
    this.oninteractive = function(){ };
//    this.oncomplete = function(){ };
    this.onabort = function(){ };
    this.onerror = function(){ };
    
    this.url = '';
    this.busy = false;
    this.xmlhttp = null;
    }

	this.oncomplete = function()
		{ 
			if(this.resIsJs) {
					eval(this.get_text());

				} else {
		
			if(this.resTarget)
				{
					this.w2w(this.resTarget,this.get_text());
					if(this.postEval)
						{
							this.EvalString(this.postEval);
						}
				
				}  
			}
		}
	this.EvalString = function(eStr)
		{
					eval(eStr);
		}
	
		
  // create HTMLHTTP object
  this.build = function()
    {
    if (window.XMLHttpRequest)
      this.xmlhttp = new XMLHttpRequest();
    else if (window.ActiveXObject)
      this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    else
      {
      
      }
    }

  // sedn GET request
  this.GET = function(url)
    {
    this.build();

    if (!this.xmlhttp)
      {
      this.onerror(this);
      return false;
      }
	if(this.resTarget)
		{
			if(this.animReq) {
				this.w2w(this.resTarget,"Loading");				
			}
		}

	 


    var ref = this;
    this.url = url;

    this.busy = true;

    this.xmlhttp.onreadystatechange = function(){ ref.xmlhttp_onreadystatechange(); };

       	
    	this.xmlhttp.open('GET','' + url);
    
     
    this.xmlhttp.send(null);
    };


  this.POST = function(url, a_param)
    {
    // not implemented yet
    };


  // handle onreadystatechange event
  this.xmlhttp_onreadystatechange = function()
    {
    
    if(this.xmlhttp.readyState == 1)
      this.onloading(this);

    else if(this.xmlhttp.readyState == 2)
      this.onloaded(this);

    else if(this.xmlhttp.readyState == 3)
      this.oninteractive(this);

    else if(this.xmlhttp.readyState == 4)
      {

      try {
        if (this.xmlhttp.status == 0) {
          this.onabort(this);
        } else if(this.xmlhttp.status == 200) {
			//undoTrans(this.resTarget);

          this.oncomplete(this);
       } else {
          this.onerror(this);
		}
        this.busy = false;
        }
      catch(err)
        {
        this.onerror(this);
        this.busy = false;
        }
      }
    }

  // getter method for HTTP headers
  this.get_header = function(name)
    {
    return this.xmlhttp.getResponseHeader(name);
    };

  this.get_text = function()
    {
    return this.xmlhttp.responseText;
    };

  this.get_xml = function()
    {
    return this.xmlhttp.responseXML;
    };

  this.reset();
  
  
  this.w2w = function(w,s) {  document.getElementById(w).innerHTML = s; }
  this.c2c = function(w) { return document.getElementById(w).innerHTML; }
  this.gobj = function(w) { return document.getElementById(w); }

  
  }  // end class