function overlayopen(url,divid,blackoverlayid)
  {
   //var geturl=url.toLowerCase()+"&"+Math.random();
   var geturl=url+"&"+Math.random();
   var browserName = whichBrs();
   var bodywidth=0,bodyheight=0;
   var leftPos=0,topPos=0,openinframe=0;
   var indexwidth=0,indexheight=0,setwidth=0,setheight=0;
   topPos=(screen.height / 2)-310;

   openinframe=geturl.indexOf("frame=yes");
   bodywidth = parseInt(document.body.scrollWidth);
   bodyheight = parseInt(document.body.scrollHeight);

   indexwidth=geturl.indexOf("width=");
   indexheight=geturl.indexOf("height=");

  //find width and height passing by parameters 
  if(geturl.indexOf("width=")>0 && geturl.indexOf("height=")>0)
	{
	 indexwidth=geturl.indexOf("width=")+6;
	 indexheight=geturl.indexOf("height=")+7;
	 setwidth= parseInt(geturl.substring(indexwidth,indexwidth+3),10);
	 setheight= parseInt(geturl.substring(indexheight,indexheight+3),10);
	}
	else{setwidth=730;setheight=460;}	// default width and height if it is not sending by parameters

  //set LeftPosition of overlay container
   if(setwidth < bodywidth && setheight < bodyheight){
	   leftPos=parseInt(bodywidth/2-setwidth/2,10);
	}
   else
	  {setwidth=730;setheight=460;}   // default width and height when wrong parameters passed

	//Check whether request to iframe or AJAX call
   if(openinframe > 0)
   {
	  if(document.getElementById("overlayiframe")){
	   //document.getElementById("overlayiframe").style.background=" ";
	   document.getElementById("overlayiframe").src=geturl;
	   document.getElementById("overlayiframe").style.width=setwidth+"px";
	   document.getElementById("overlayiframe").style.height=setheight+"px"; }
   }
   else{
   	if(document.getElementById("overlaybox")){
   		  document.getElementById("overlaybox").style.width=setwidth+"px";
		    document.getElementById("overlaybox").style.height=setheight+"px";
	   }
	}
	
	 document.getElementById(divid).style.left=leftPos+"px";
   document.getElementById(divid).style.top=topPos+"px";
   document.getElementById(blackoverlayid).style.height=bodyheight+"px";

   if(browserName=="IE"){document.getElementById(blackoverlayid).style.width=bodywidth+"px";document.getElementById(blackoverlayid).style.height=bodyheight+"px";}
   if(browserName=="Firefox"){document.getElementById(blackoverlayid).style.height=bodyheight+"px";	document.getElementById(divid).style.top=topPos-30+"px";}

  	document.getElementById(divid).style.display="block";
  	document.getElementById(blackoverlayid).style.display="block";
  }	
  
  
  function overlayclose(divid,blackoverlayid)  {
  	if(!document.getElementById) return;
  	if(divid=="overlaycontents"){
  			document.getElementById("overlaycontents").style.display="none";
			document.getElementById(blackoverlayid).style.display="none";
			document.getElementById("overlayiframe").src="../images/spacer.gif";
			document.getElementById("overlayiframe").style.background="transparent url(../images/loader.gif) no-repeat 50% 50%";
			}		
  	else{
  			document.getElementById("overlaycontentsDIV").style.display="none";document.getElementById(blackoverlayid).style.display="none"; }
 	}
    
  
function whichBrs(){
		var agt=navigator.userAgent.toLowerCase();
		if (agt.indexOf("opera") != -1) return 'Opera';
		if (agt.indexOf("staroffice") != -1) return 'Star Office';
		if (agt.indexOf("webtv") != -1) return 'WebTV';
		if (agt.indexOf("beonex") != -1) return 'Beonex';
		if (agt.indexOf("chimera") != -1) return 'Chimera';
		if (agt.indexOf("netpositive") != -1) return 'NetPositive';
		if (agt.indexOf("phoenix") != -1) return 'Phoenix';
		if (agt.indexOf("firefox") != -1) return 'Firefox';
		if (agt.indexOf("safari") != -1) return 'Safari';
		if (agt.indexOf("skipstone") != -1) return 'SkipStone';
		if (agt.indexOf("msie") != -1) return "IE";
		if (agt.indexOf("netscape") != -1) return 'Netscape';
		if (agt.indexOf("mozilla/5.0") != -1) return 'Mozilla';
		if (agt.indexOf('\/') != -1) {
		if (agt.substr(0,agt.indexOf('\/')) != 'mozilla') {
		return navigator.userAgent.substr(0,agt.indexOf('\/'));}
		else return 'Netscape';} else if (agt.indexOf(' ') != -1)
		return navigator.userAgent.substr(0,agt.indexOf(' '));
		else return navigator.userAgent;
}

/* Ajax functions */

function AJAXInteraction(div,url, callback) {
    var req = init();
    req.onreadystatechange = processRequest;

function init() {
      if (window.XMLHttpRequest) {
        return new XMLHttpRequest();
      } else if (window.ActiveXObject) {
        return new ActiveXObject("Microsoft.XMLHTTP");
      }
    }

function processRequest () {
			if (req.readyState == 4) {
        if (req.status == 200) {
          if (callback) {
            if(document.getElementById(div) != null) {
            	  callback( document.getElementById(div).innerHTML=req.responseText);
                  overlayopen(url,"overlaycontentsDIV","blackoverlay");
            }
            }
		}
      }
    }
this.doGet = function() {
      req.open("GET", url, true);
      req.send(null);
    }
this.doPost = function(body) {
      req.open("POST", url, true);
      req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      req.send(body);
    }
}

function makeRequest(url,div) {
		var ai = new AJAXInteraction(div,url, function() { });
    ai.doGet();
}

/* Ajax functions */