var browser = "";
var browsername = navigator.appName;
var browserversion = parseInt(navigator.appVersion);
if (browsername == "Netscape")
        {
        browser = "ns" + browserversion;
        }
        else
        {
    if (browsername == "Microsoft Internet Explorer")
                {
        if (browserversion >= 4)
                        {
            browser = "ie" + browserversion;
                        }
                else
                        {
            browser = "ie3";
                        }
                }
        }
function win_pop(url,name,features)
        {
        if ((browser == "ns3","ns4") || (browser == "ie4"))
                {
                popBox = window.open(url,name,features);
                }
        else
                {
                if (browser == "ie3") {
                popBox = window.open(url,name,features);
                }  
        }
}