The gap can be removed, sure. Simply move the HTML for the drop down DIVs themselves outside any container tag on the page other than the BODY. So in your case, try moving all the drop down DIVs to the bottom of your page, just above the "</body>" tag:
Code:
<!--1st drop down menu -->
<div style="top: 168px; left: 340px; visibility: hidden;" id="dropmenu1_e" class="dropmenudiv_e">
<a style="border-top-width: 0pt;" href="http://www.herpmist.com/pumpsafety.shtml">Pump Safety</a>
<a href="http://docs.google.com/Doc?id=dg284n8q_8gh5wkw&pli=1" target="_blank">Installation Instructions</a>
<a href="http://spreadsheets.google.com/pub?key=pl_sqGQzEA_sd2mKSemcEYQ" target="_blank">Nozzle Data</a>
</div>
<!--2nd drop down menu -->
<div id="dropmenu2_e" class="dropmenudiv_e" style="width: 200px; top: 168px; left: 466px; visibility: hidden;">
<a style="border-top-width: 0pt;" href="http://www.herpmist.com/tiki.shtml">Tiki Tiki Reptiles</a>
<a href="http://www.herpmist.com/cbd.shtml">Cages By Design - Jungle Carpet Cage</a></div>
<!--3rd drop down menu -->
<div id="dropmenu3_e" class="dropmenudiv_e" style="width: 150px; top: 168px; left: 726px; visibility: hidden;">
<a style="border-top-width: 0pt;" href="http://www.herpmist.com/about.shtml">About HerpMist.com</a>
<a href="http://www.herpmist.com/contact.shtml">Contact Us</a>
<script type="text/javascript">
//SYNTAX: tabdropdown.init("menu_id", 0)
tabdropdown.init("moonmenu", "AUTO")
</script>
</body>
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