Layout Problems with IE

Using contact for 7 on homepage at bostonsquarelock.info using the following code:

<div id="homepageoptinform">
<div style="float:left; margin-left:15px; margin-top:10px;">
[text* your-name class:spotform1 watermark "Enter name"]
[text* your-phone class:spotform1 watermark "Enter phone #"]
[email* your-email class:spotform1 watermark "Enter email"]
</div>
<div style="float:right; margin-right:15px; margin-top:10px;">
[textarea* your-message x3 class:spotform2 watermark "Enter message"]
<div style="float:left;">
[submit class:contact1 "Submit Your Info"]
</div>
</div>
</div>
<div style="clear:both;"></div>

[Please post code & markup between backticks or use the code button. Your posted code may now have been permanently damaged by the forum’s parser.]

It looks fine in Firefox, Safari, etc. (I’m on a Mac) but renders terribly in IE.

Any help would be greatly appreciated.

http://wordpress.org/extend/plugins/contact-form-7/