The color on your site is working fine, now, for me. Just change all these:
HTML Code:
<a href="javascript:changeBGImage(1)"><img src="colors/black.png" title="select a background color" class="footer"/></a>
to this:
HTML Code:
<img src="colors/black.png" title="select a background color" class="footer"
 onclick="return changeBGImage(1)" style="cursor:pointer;" />