function popWin(winURL,winName,winWidth,winHeight)
 {
 	 var winLeft = (screen.width - winWidth)/2;
 	 var winTop  = (screen.Height / 2 - winHeight)/2;
 	 winProps = 'width='+winWidth+',height='+winHeight+',left='+winLeft+',top='+winTop+'' ;
   	 theWin = window.open(winURL, winName, winProps);

 	 if (parseInt(navigator.appVersion) >= 4)
 	 {
 	 	 theWin.window.focus();
 	 }
 }