//open centered popup
function openPopup(URL, ident, width, height, scrolling){

	if(height > screen.availHeight){
		scrolling = "yes";
		width += 17;
	}

	var startX = ((screen.availWidth - width)/2);
	var startY = ((screen.availHeight - height)/2);		
	var options = "height=" + height + ",width=" + width + ",left=" + startX + ",top=" + startY + ",screenX=" + startX + ",screenY=" + startY + ",directories=no,location=no,menubar=no,resizable=no,noresize,scrollbars="+scrolling+",status=no,titlebar=no,toolbar=no";
	var objWindow = window.open(URL, ident, options);
	objWindow.focus();
}