Div stretching

Hello again.
Big thanks to wolfcry911 for the help last problem -- that worked a treat. I'm scratching my head on something else that doesn't appear to be browser specific: stretching a div to fill the empty space.

URL: http://www.gaekwad.com/default/test.php

Code to display div:

<div class="div_static_main">

main

</div>

And the code in the stylesheet:

.div_static_main {
	background-color:#ff00ff;
	float:left;
	margin:0px 3px 0px 0px;
	padding:0px;
	text-align:center;
	vertical-align:middle;
	}

I'd like that pink div to stretch over and butt up against the title/sidebar divs on the right hand side. I'm currently trawling the CSS documentation for an answer, any pointers would be very much appreciated.

Thanks all in advance.