function pen_ac(url, ht, wt){

var browser=navigator.appName;

if (browser=="Microsoft Internet Explorer")
{
yeksen=230;
}
else
{
yeksen=260;
}

	var x = (screen.width-500)/2
	var y = (screen.height-260)/2;
	xPos = (x > 0) ? x : 0;
	yPos = (y > 0) ? y : 0;


pencere = window.open(url,'pencere','toolbar=0,location=0,directories=0,status=0,status=no,menubar=0,scrollbars=yes,resizeable=no,resize=no,width='+wt+',height='+ht+',screenX=0,resize=no,screenY=0,top='+yPos+',left='+xPos)
				if (window.pencere) pencere.focus();
}