function new_window(url) {
	var width = (screen.availWidth) - 100;
	var height = (screen.availHeight) - 180;
	var left = (screen.availWidth - width) / 2;
	properties = 'top=0, left='+left+', width='+width+', height='+height+', resizable=1, scrollbars=1, menubar=1, toolbar=1, location=1, directories=1'
	
	openWindow = window.open(url, 'name', properties);
}