function GetDownloadURL() {
    // if Silverlight is installed then override CSS elements to accommodate the Silverlight control
    if (Silverlight.isInstalled("2.0.30523.8")) {
        // Download the MSI Only at http://download.microsoft.com/download/6/7/F/67FBEA91-3659-47B2-950C-5A5C4C602892/tlbsetup_msd_en-us.msi
        return "http://go.microsoft.com/?linkid=9647955";
    }
    else {
        // Download the MSI (which includes Silverlight) at http://download.microsoft.com/download/6/7/F/67FBEA91-3659-47B2-950C-5A5C4C602892/toolbarsetup_SL2.0_B2_msd_en-US.exe
        return "http://go.microsoft.com/?linkid=9647956";
    }
}