url forwarding/masking breaks is_home()

I am using GoDaddy to forward to and mask my domain, the problem is that I think the way that Godaddy masks the url breaks the is_home function such that it returns false on the home page of my site.

<?PHP
//decide which section title to display
if (is_home())
{
echo '<div class="homepic"></div>';
}
else
{
echo '<div class="codepic"></div>';
}
?>

So when I turn the url forwarding off and I also set the URI in the options page to the non-forwarded url, the function works. When I turn it on, and change the settings in the options page to match, it breaks and the 2nd div is displayed. Is there any way to fix this?