In our organization, we are still on .net 1.1 environment, using javascript, a few open source applications/widgets. Development is done using Visual Studio 2003, grid view, and iframes. Our application works in Internet Explorer 7 and IE 8 (in compatibilily mode). Can anyone give any basic steps we can take to get our application to work cross browsers? What are the starting locations we can get at to start making existing code work in different browsers?
['https://Stackoverflow.com/questions/2568467', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/-1/']
Use jQuery for reliable cross browser JavaScript

Was it VS 2k or VS 2k3 that "helped" the developer by rewriting their HTML (in all CAPS no less)?
Make your HTML markup standards compliant. I find that developing my website following W3C standards ensure that my sites work in all major browsers.

I also develop in Firefox and then fix IE using conditional stylesheets.

The .NET version does not matter on browser compatibility.