One way to fix many of the issues with IE7 is to dynamically reverse the default z-index stacking order of the elements on your page. This will ensure the elements higher in your HTML source will also have a higher z-index order on your page, solving most of the IE stacking issues. If you’re using jQuery (the best Javascript library there is), here’s the quick fix:

var zIndexNumber = 1000;
$('div').each(function() {
	$(this).css('zIndex', zIndexNumber);
	zIndexNumber -= 10;
});