Here’s the quick answer – it will probably take you longer than a week 🙂
The best thing to do is view your website in different browsers and see what the problems are. You have been a bit vague in your question, but you could be looking at having to fix UI issues and possbily JavaScript problems.
Which version of IE are you supporting? You need to take this into account since developing for cross browser support means not only fixing problems for modern browsers, but making sure that older browsers are not broken.
This is a very open-ended question, and the best suggestion I have is the above. There is no way to convert an application to magically be cross-browser compatible. It’s going to be a manual job unfortunately.
Most importantly, you need to to measure how bad things are in other browsers before you can get a plan together of what it will take to fix.
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solved Make my Asp.Net application support all browser [closed]