function openPopup(url, name, w, h)
{
	width = (arguments[2] != null)?(arguments[2]+40):600;
	height = (arguments[3] != null)?(arguments[3]+40):400;
	
	if(navigator.appName == "Microsoft Internet Explorer") {
		screenY = window.screen.availHeight;
		//screenY = document.body.offsetHeight;
		screenX = window.screen.availWidth;
	}
	else {
		screenY = window.outerHeight;
		screenX = window.outerWidth;
	}
				
	x = (screenX - width) / 2;
	y = (screenY - height) / 2;
	
	properties = "width=" + width + ",height=" + height + ",left=" + x +  ",top=" + y + ",scrollbars";
	
	open(url,name,properties);
	
	return;
}


function setPackage(name){
	var sel = document.getElementById('package_' + selected);
	var new_sel = document.getElementById('package_' + name);
	
	sel.style.display = 'none';
	new_sel.style.display = 'block';
	selected = name;
}