[Theme: Twenty Eleven] Custom Nav Menu Buttons issue

Hi all,
I have two problems with my Twenty Eleven (child) with custom nav menu buttons. Here’s the site:
http://rebuildwarehouse.org

If you mouse-over the green email/facebook/paypal buttons at the top you’ll notice that the link areas overlap (the designated link alternates quickly between paypal/facebook depending on where the cursor is on either button). I am sure that I’m misunderstanding something in the CSS but I don’t know what.

My second issue is that I would like to use the paypal-provided code on the nav-menu paypal button (a functioning version is in the sidebar) but I’m not sure where to insert the form code, which looks like this:

<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="hosted_button_id" value="xxxx">
<input type="image" src="http://rebuildwarehouse.org/images/paypal.png" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
<img alt="" border="0" src="https://www.paypal.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>

[Please use the code buttons to post code here – as is, your code may have been damaged by the parser.]

Any assistance is much appreciated, thanks!