1584px fixed width... wow! Are you expecting everyone who uses your site to have an ultra-widescreen monitor? Or will they be ok with scrolling back and forth? Or what is the purpose of that width?

At any rate, there are some missing bits in your CSS as shown.

#flashmainnav {
height: 612px;
width: 684; <--------add px
position: absolute;
top: 137px;
left: xxxpx; <------add
}


#contrypicture { <-----is this spelled correctly (matching your code tag)?
position: absolute;
height: 134px;
width: 157px;
left: 684px;
top: xxxpx; <------add
}

(Other absolute items need top & left too...)

Once you have those, your images should start to work, and then you can make adjustments as required.