There is your client, complaining that they can’t see the changes you just made to their website. You explain them that they need to delete their browser cache in order to properly visualize the modifications. They said they don’t know how, and this is when you lose your patience and decide for a more radical solution. We are developers right? there has to be something easier than explaining the client how to delete their cache. Read on for more.
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IE7 behaves strangely when we talk about z-index. It doesn’t always respect the z-index values of our elements. However, if you come around this weird stuff, just add a higher z-index to the parent of the element you want to put above everything else. Don’t ask me why this works but it does!

Lets take a look at a small example:

<div style="z-index: 3000">
  <div style="position:absolute;z-index:1000;">
    this element will appear above everything else
    <a href="#">Page</a>
        ...
  </div>
</div>