Footer missing

[mhmhc]

Hey guys,
While editing my xhtml code and CSS styles, I have somehow managed to make the footer not appear in internet explorer.
My CSS style for the footer is:

.footer {
background-image: url(footer.gif);
margin-left: auto;
margin-right: auto;
width: 800px;
height: 75px;
text-align: center;
padding-top: 15px;
}

and the xhtml is simply:

<div class="footer">
</div>

I have checked and the file 'footer.gif' is still in the folder.
If more information is needed I'm happy to give it.
Any help is appreciated. Thanks

[mhmhc]

managed to sort the problem out by deleting one of the elements in my CSS file. Don't know why that was causing a problem as it wasn't even being used in the XHTML file at that point.