function pop(url) { 
	
	day = new Date();

	eval("page" + day.getTime() + " = window.open(url, '" + day.getTime() + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=600,height=400,left = " + (document.viewport.getWidth() - 600)/2 + ",top = " + (document.viewport.getHeight() - 400)/2 + "');"); 
	
}