function popup(arg, toolbar, status, menubar) {
    var desktop = window.open(arg, "_blank", "toolbar=" + toolbar + ",status=" + status + ",menubar=" + menubar + ",location=yes,scrollbars=yes,width=660,height=480,resizable=yes");
}

function search() {
    var strSearch = "";
    if (document.getElementsByName("shipper")[3].checked) {
        strSearch = "https://www.con-way.com/scripts/PROTrace.asp?PRO=" + document.getElementById("trackingnum").value;
    }
    else if (document.getElementsByName("shipper")[2].checked) {
        strSearch = "http://track.airborne.com/atrknav.asp?ShipmentNumber=" + document.getElementById("trackingnum").value;
    }
    else if (document.getElementsByName("shipper")[1].checked) {
        strSearch = "http://www.fedex.com/cgi-bin/tracking?action=track&language=english&cntry_code=us&initial=x&tracknumbers=" + document.getElementById("trackingnum").value;
    }
    else {
        strSearch = "http://wwwapps.ups.com/etracking/tracking.cgi?tracknums_displayed=1&TypeOfInquiryNumber=T&HTMLVersion=4.0&InquiryNumber1=" + document.getElementById("trackingnum").value;
    }

    popup(strSearch, 'yes', 'yes', 'yes');
    this.document.forms['tracking'].num.value = "";
}