function Popup(url, window_name, window_width, window_height)
{ settings= "toolbar=no,location=no,directories=no,"+ 
"status=no,menubar=no,scrollbars=yes,"+ 
"resizable=yes,width="+window_width+",height="+window_height; 

NewWindow=window.open(url,window_name,settings);
 return false;
 }