Cross-browser (IE) troubleshooting Jquery/CSS

Hello, I have some troubles with a website. I am using that Isotope plug-in for Jquery, and it does not display properly in IE (<= 9) the elements (hidden elements are visible, overlapping each others). This is the main issue to be solved. Also, you would need to check and debug any basic cross-browser/plateforms compatibility issue. It has to be done as soon as possible (tonight for sure). It should take less than an hour (you will be paid for one hour for resolving the issue of the overlapping elements in IE, or twohours if it is required in order to debug other stuff...), as it is supposed to work perfectly in Firefox/Chrome/Safari. Please note: this is a confidential project for one of my clients. Thanks