var newwindow;

function poptastic(url, Width, Height) {
	//var Width = 850;
	//var Height = 470;
	var posX=(screen.availWidth-Width)/2;
	var posY=(screen.availHeight-Height)/2;
	// scrollbar-fix for user with low res.
	var bars = (screen.width <= 800) ? 'yes' : 'no';
	newwindow = window.open(url,'thething','toolbar=no,scrollbars=' + bars +',vscrolling=no,directories=no,resizable=no,menubar=no,width=' +Width+',height='+Height+',screenX=" + posX + ",screenY=" + posY + ",left=" + posX + ",top=" + posY+ "');
	if (newwindow && newwindow.open && !newwindow.closed) {
		jump = true;	
		var center = screen.width/2;
		var center2 = screen.height/2;
		var middle = center - (Width/2);
		var middle2 = center2 - (Height/2);
		newwindow.moveTo(middle-5,middle2-5);
		newwindow.focus();
	} else {
		jump = false;
	}
	//if (jump) { self.location.href="/"; }
	return false;
}