twitter bootstrap IE9, nav collapse not pushing rest of content down - html

Question

Im not sure is this an issue with the content below it, or nav-collapse itself, But the only way I can seem to replicate the issue in firefox is by changing float:left to float:none in the code below. Basically when I toggle the menu the content below it doesnt get pushed down in IE9
.navbar .navbar-inner .nav-collapse.collapse
{
background: #6E2E8F;
border-radius: 5px 5px 5px 5px;
float: left;
height: 0px;
margin-bottom: 15px;
padding: 0;
width: 100%;
}
.navbar {overflow: visible;}
Here is the outputted html...
<div class="navbar">
<div class="navbar-inner">
<a data-target=".nav-collapse" data-toggle="collapse" class="brand visible-phone"> Categories</a>
<a data-target=".nav-collapse" data-toggle="collapse" class="btn btn-navbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</a>
<div class="nav-collapse collapse">
<ul class="nav">
<li>***CONTENT***</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
<span>Start Shopping
</span><span class="active_downarrow"></span></a>
<span class="sub-menu-response">
<ul class="dropdown-menu" > ***CONTENT*** </ul>
<ul class="dropdown-menu" > ***CONTENT*** </ul>
<ul class="dropdown-menu" > ***CONTENT*** </ul>
<ul class="dropdown-menu" > ***CONTENT*** </ul>
<ul class="dropdown-menu" > ***CONTENT*** </ul>
</span>
</li>
<li> ***CONTENT*** </li>
<li> ***CONTENT*** </li>
<li>***CONTENT*** </li>
</ul>
</div>
</div>
</div>
Here is the link to the site... http://bc_mobile.hailstormcommerce.com/

Answer 1

You can try adding this css class:
.nav-collapse.collapse.in {
height: auto !important;
}
Because when you drop-down the navigation, bootstrap gives it an initial width fixed.