var popped = null;

function pop(width, height, url) {

	var h = height;	
	var w = width;

	var x = (window.screenX) ? window.screenX : (window.left) ? window.left : 100;
	var y = (window.screenY) ? window.screenY : (window.top) ? window.top : 50;

	if (popped && popped.open && !popped.closed) {
		popped.focus();
		popped = window.open(url,'popup');

	} else {
		strOptions = "toolbars=0,directories=0,scrollbars=1,location=0,";
		strOptions += "width="+w+",";
		strOptions += "innerWidth="+w+",";
		strOptions += "height="+h+",";
		strOptions += "innerHeight="+h+",";
		strOptions += "screenX="+x+",";
		strOptions += "left="+x+",";
		strOptions += "screenY="+y+",";
		strOptions += "top="+y;
		popped = window.open(url,'popup',strOptions);
	}

	return false;
}