CSS Expert Wanted

!!URGENT!! We have a website designed in valid xHTML 1.0 & CSS, but I can't figure out why our menu bar won't display correctly in IE6/7(It displays fine in Firefox). You task is to fix the menu bar, let it display correctly in both versions of IE without breaking the xHTML 1.0 & CSS rules. I can provide you a screen shoot if required via PMB. Escrow payment can be provided via request. !!URGENT!!