// JavaScript Document
 function popup(url,name,windowWidth,windowHeight,option){      
     myleft=(screen.width)?(screen.width-windowWidth)/2:100;   
     mytop=(screen.height)?(screen.height-windowHeight)/2:100;     
     properties = "width="+windowWidth+",height="+windowHeight+","+option+", top="+mytop+",left="+myleft;  
     //properties +=option+", top="+mytop+",left="+myleft;     
     window.open(url,name,properties);  
 }