function popup(url,winName,wid,heigh){
var sw=(screen.width/2)-(wid/2);
var sh=(screen.height/2)-(heigh/2);
mywin=window.open("about:blank",winName,
"width="+wid+",height="+heigh);
mywin.document.write("“);
mywin.document.write("self.window.moveTo("+sw+","+sh+");");
mywin.document.write("self.location=""+url+"";");
}