xGap=(navigator.appName == "Netscape")?11:9;
yGap=(navigator.appName == "Netscape")?31:29;

function footer(quale)
{
            var xCrd=(screen.availWidth-500-xGap)/2;
            var yCrd=(screen.availHeight-500-yGap)/2;
            windowFeatures = 'width=500,height=500,status=no,top='+yCrd+',left='+xCrd
            newWindow=window.open("http://cdn.cloudfiles.mosso.com/c124431/"+quale+".html", "popFooter", windowFeatures);
}