// Global variable that holds whether the browser supports the W3C DOM
var W3CDOM = (document.createElement && document.getElementById && document.getElementsByTagName);

function open_window(url, name, width, height)
{
	var top, left, features;
	
	top = (screen.height / 2) - (height / 2);
	left = (screen.width / 2) - (width / 2);
		
	if(top < 0)
		top = 0;
		
	if(left < 0)
		left = 0;

	features = 'scrollbars=1,location=0,menubar=1,status=0,width='+width+',height='+height+',left='+left+',top='+top+',resizable=1';
	
	window.open(url, name, features);
}