///////////////////////////////////////////////////
// Arguments:
//          sURL – (string) the URL page of the page to open within the popup window.
//          sName - (string) [optional] the popup name that IE will be related to.
//          popWidth = (integer) popup width.
//          popHeight – (integer) popup height.
// Return: void
// Description:
//    The function will open a new popup window with a given page URL, popup width and height.
//    The function will center the popup exactly on the center of the user screen.
//    The function used as an object, and hold the popup object as well, for later use if needed.
///////////////////////////////////////////////////
function openPop ( sURL, sName, popWidth, popHeight ) 
///////////////////////////////////////////////////
{
var w = screen.availWidth; 
var h = screen.availHeight;
var leftPos = (w-popWidth)/2;
var topPos = (h-popHeight)/2;
var properties = 'width='+ popWidth +', height=' + popHeight + ',resizable=no,scrollbars=yes,left='+ leftPos + ',top=' + topPos;

if (!sName ) sName = 'popwin';
      openPop.popup = window.open ( sURL, sName, properties);
openPop.popup.focus();
}

<!--
function launchwin(winurl,winname,winfeatures) {
                var newwin;
                
                //This launches a new window and then focuses it if window.focus() is supported.
                newwin = window.open(winurl,winname,winfeatures);
                
                if(javascript_version > 1.0) {
                    //delay a bit here because IE4 encounters errors when trying to focus a recently opened window
                    //setTimeout('newwin.focus();',250);
                }
            }    
//-->

var bName = navigator.appName;
var bVer = parseInt(navigator.appVersion);
var NS4 = (bName == "Netscape" && bVer >= 4 && bVer < 5);
var NS6 = (bName == "Netscape" && bVer >= 5);
var IE4 = (bName == "Microsoft Internet Explorer" && bVer >= 4);
var NS3 = (bName == "Netscape" && bVer < 4);
var IE3 = (bName == "Microsoft Internet Explorer" && bVer < 4);
 
var styleUrl;
if (IE4 || NS6) { styleUrl = 'images/Background/style_ie.css'; }
else if (NS4) { styleUrl = 'images/Background/style_nn.css'; }
document.write('<link href="' + styleUrl + '" rel="stylesheet" type="text/css">');

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->