var y1=(screen.availHeight-200)/2;
var x1=(screen.availWidth-260)/2;

var w="";
var h="";
function openWin(url,w,h)
{
  var strOptions = "height="+h+",width="+w+",status=no,toolbar=no,menubar=no,location=no,scrollbars=yes,directories=no,copyhistory=no,resizable=yes,screenX="+x1+",screenY="+y1+"";
  if (url != "") myWin = open(url,"NewWin", strOptions);
}