var popupWin = null;

function openWindow(url,top,left,width,height) {

var screenWidth = screen.availWidth;
var screenHeight = screen.availHeight; 

popupWin = window.open(url,'popup','channelmode=0,dependent=1,directories=0,fullscreen=0,location=0,menubar=0,resizable=1,scrollbars=0,toolbar=0,top=' + top + ',left=' + left + ',width=' + width + ',height=' + height)

}