Gap underneath my mast in IE6

[cactusg]

Hi,

Underneath the mast on my site I have a gap on IE6. On IE7 & Firefox it looks just fine.

SITE

http://www.wdbuild.com/daviesflowershop/

CSS

#mastcont
{
width:785px;
height:88px;

}

#mast
{
width:475px;
height:88px;
background-color:#f4cadd;
background-image:url(images/davies_mast1.gif);
float:left;

}

#mastflash
{
width:310px;
height:88px;
background-color:#f4cadd;
float:left;

}

#nav
{
width:785px;
height:30px;
background-color:magenta;
background-image:url(images/nav_middle.gif);
clear:both;

}


#cont
{
width:785px;
background-color:white;
clear:both;

}

XHTML











                                      {breadcrumbs}
                                      {search submit="Go"}

                               

                               
                                          {menu template='davies_menu'}
                               

I'd be grateful if anyone could point me in the right direction with this problem, cheers