ASP.NET CSS Postback Stripped???

I have an ASP.NET master page  that contains a header and footer enclosed in a table.  The master page contains a link to my CSS file which my header login link uses for a roll-over button.  I've setup CSS as follows:

    background-image: url(../images/SimpleButtonUp.gif);
    background-color: transparent;
    color: White;
    cursor: pointer;
    width: 80px;
    height: 23px;

    background-image: url(../images/SimpleButtonDown.gif);

This works perfectly upon loading my home page but navigating anywhere else results in the background image being stripped from the CSS.  The relative path to the background image is EXACTLY the same as any of the pages I navigate to.

What's going here?  How do I make my master page CSS survive posting?
Who is Participating?
Miguel OzConnect With a Mentor Software EngineerCommented:
Are your pages in the same physical location?
(../images/SimpleButtonUp.gif) is relative path.
Make sure all pages that use this css are on the same folder.
Phil5780Author Commented:
Ok, after further trial and error I find that my CSS in the sheet (just the markup shown above) gets ignored after postback. The page I begin with and the page I navigate to are in the same relative location.  The postback is breaking my CSS, how do I fix this?
Saqib KhanSenior DeveloperCommented:
try to specify the absolute path

background-image: url(/ParentFolder/images/SimpleButtonUp.gif);
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There maybe a problem in where you put your link to the CSS and might be causing you the break. You can check if you have done the same as this:

<head runat="server">

  <style type="text/css" media="all">
    @import "styles/styles.css";

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Miguel OzSoftware EngineerCommented:
Can you post your css file markup (How are you adding it to master page?)
e.g in
 <head runat="server">

    <link href="Styles/myCssSample.css" rel="stylesheet" type="text/css" />  
Phil5780Author Commented:
You were right, my relative path was wrong.  No everything work just fine.
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