IE7 extra space?

Hi guys.. okay i got a new problem. and i've been at it since this morning.. darn..

well i thought i did all i know to fix the problem, but can't do so..

so the problem is there's an extra expansion of the right containing div..
on Firefox it looks just fine.. but on IE.. it's not..

here's the link.. http://www.leaningdogmarketing.com/ .. can you help me out on this?

Thanks

Try

#left_content {/*style.css (line 23)*/
background:transparent url(images/rex_turner.gif) no-repeat scroll 0;
float:left;
height:412px;
/*margin:0 10px 0 0;*/
width:278px;
}
#right_content {/*style.css (line 30)*/
/*float:left;
width:520px;*/
margin-left:290px;
}
#bot ul li {/*style.css (line 79)*/
float:left;
margin:0 6px;
display:inline;
}

well abdur.. it's still a no go.. :(

but i have fixed it some how.. i placed a 1px boderline on the #bot div.. and then that fixed it..

but i don't know why.. but it's looking fine on IE7 and FF..

do you know why?

Thanks