Why is my jQuery tab section so large

I have 2 columns on my page. The left column contains a list and the right column contains a jQuery tab. I do not understand why my tab header in the right column seems to have the same height as the list in the left column.

For an example go to: http://anna.adreflex.com/tabtest.cfm

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<link type="text/css" href="jqueryui/css/smoothness/jquery-ui-1.8.17.custom.css" rel="stylesheet" />

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js" type="text/javascript"></script>
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.8.23/jquery-ui.min.js" type="text/javascript"></script>

<style type="text/css">
		width: 150px;
	.leftcolumn ul

		<div class="leftcolumn">
			<span class="PageTitle" style="vertical-align:bottom">My Groups</span>
				<li>test 1</li>
				<li>test 2</li>
				<li>test 3</li>
				<li>test 4</li>
				<li>test 5</li>
				<li>test 6</li>
		<div class="rightcolumn groupsection">
			<div id="lay1">
					<li><a class="ui-tabs-nav TabTitleStyle" href="#lay1_Tab1">tab 1</a></li>
					<li><a class="ui-tabs-nav TabTitleStyle" href="#lay1_Tab2">tab 2</a></li>
					<li><a class="ui-tabs-nav TabTitleStyle" href="#lay1_Tab3">tab 3</a></li>
				<div id="lay1_Tab1">
					Tab 1 Content
				<div id="lay1_Tab2">
					Tab 2 Content
				<div id="lay1_Tab3">
					Tab 3 Content


<script type="text/javascript">


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Julian HansenCommented:
Because your left column is floated left and your right is not so the tab header section is floating next to the left column and being cleared before the tab body.

Change .rightcolumn to

	float: left;

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F IgorDeveloperCommented:
You could remove the "margin-left:155px;" and put only the "float:left" (margin will not be necessary )
Julian HansenCommented:

You could remove the "margin-left:155px;" and put only the "float:left" (margin will not be necessary )

That is what I put in my post prior to yours.
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