function openCenterWin(url,theWidth,theHeight){
	var theTop = (screen.height/2)-(theHeight/2);
	var theLeft = (screen.width/2)-(theWidth/2);
	var features = 'height='+theHeight+',width='+theWidth+',top='+theTop+',left='+theLeft+",scrollbars=yes";
	theWin=window.open(url,'',features);
}