CSS debugging for IE6 & 7

We've got a site on a staging server that will need to go live shortly. We need some basic CSS debugging for IE6 & 7. The css works just fine on >IE8, Chrome, Firefox etc. Your solution may or may not include Javascript tweaks, as the site uses javascript for some of it's positioning (the jquery masonry plugin.) We expect this to be completed in as short a timeframe as possible, definitely within 24hrs, ideally within the next 6hrs. Thanks.