ASP.NET

<asp:FileUpload ID="thefile" runat="server" onchange="readURL(this);fill_out_filesize(this.files[0].size);progressBar();" itemid="thefile" value="thefile" Width="347px"   />

function progressBar() {
    //$("#progressbar").progressbar({
    //    value: 37
    //});
    alert("test");
    var variable = 1;
    var result = 0;
    do {
        result = ++variable
        $("#progressbar").progressbar({
            value: result
        });
        sleepFor(2000);
    } while (true);
}

function sleepFor(sleepDuration) {
    var now = new Date().getTime();
    while (new Date().getTime() < now + sleepDuration) { /* do nothing */ }
}

WebBrowser1.Navigate "http://www.website.com/serial.aspx"

"An error has occured in the script of this page"
Error: "Webform_Postbackoption" is undefined