Ajax Modal Popup Progress Bar/Indicator

Question

Hello all, I am having problems trying to create a modal popup progress bar in Ajax 3.5. The following works okay, but I cannot see my aspx page in VS 2008 due to the changes I made to my style sheet. It appears that the div tag i am using sits on top of the page.

Here is the code:

<asp:UpdatePanel runat="server" ID="UpdatePanel1">
    <ContentTemplate>
          <asp:Button runat="server" ID="UpdateButton" OnClick="UpdateButton_Click" Text="Update 1" />
    </ContentTemplate>
</asp:UpdatePanel>


progressBackgroundFilter {
    position:fixed; 
    background-color:#000000; 
    filter:alpha(opacity=50); 
    opacity:0.5; 
    z-index:1; 
}

processMessage { 
    position:fixed; 
    top:30%; 
    left:43%;
    padding:10px; 
    width:14%; 
    z-index:1001; 
    background-color:#ffffff;
    border:solid 1px #000000;
}