function popUpWindow(url,w,h) {
	if (document.all) {
		var xMax = screen.width, yMax = screen.height;
	}
	else if (document.layers) {
		var xMax = window.outerWidth, yMax = window.outerHeight;
	}
	else {
		var xMax = 640, yMax = 480;
	}
	var x = w, y = h;
	var xOffset = (xMax - x)/2, yOffset = (yMax - y)/2;
	window.open(url,'4D', 'width='+x+',height='+y+',screenX='+xOffset+',screenY='+yOffset+',top='+yOffset+',left='+xOffset+'');
}