function $(id)
{
	return document.getElementById(id);
}

function popup(URL,w,h,vars) {
	
        var left = (screen.width - w) / 2;
        var top  = (screen.height - h) / 2
	
	window.open(URL,"","left="+left+",top=" + top + ",width="+w+",height="+h+",scrollbars=yes" );
	
}