Internet Explorer Problem big white space in G2

Hi,

I've been trying to customize G2 so that it would have the same header, sidebar and footer as the rest of my website. I've got G2 just the way I want it, but the problem is that there is a big white space right after the breadcrumbs of G2. This big space appears only in IE. Here's a link to a screenshot [img]http://pitupepito.homelinux.org/~jose/osuss.jpg[/img] .

This problem happens whenever the following css features are enabled on the left-side (orange) navigation bar.
/* navigation */
div#t_nav
{
>-------background:#fda;
>-------float:left;.
>-------font-size:.8em;
>-------line-height:normal;
>-------padding:18px 0;
>-------width:190px;
}

Whenever float:left; and width: 190px; are enabled at the same time this hug space shows up in IE. The css that I'm using in this gallery page are 2: one from the G2 theme, and the other one from the school.

Here's a link to the school css file: http://oregonstate.edu/~cedenoj/iie/cass/css2.css
http://oregonstate.edu/~cedenoj/iie/cass/default.css

Please help me, I've spent a lot of time, and no luck so far in this problem,
Jose