not looking well arranged

Question

I have an website project build on ASP.Net extension. My website is working good in Internet Explorer but in Mozilla Firefox or Opera lots of controls are overlapped. After very goggling I got lots of solutions like you can set-up the Web.config file as

<configuration>
<system.web>
<broswerCap>

here will be some settings, but how i don't know the process, even and also how to call it from each and every pages.

</browserCap>
</system.web>
</configuration>

Lots of internet articles saying me to setup the Machine.config to eliminate such problem. I know it that microsoft is not built on standard HTML 4.0 format and this is the cause to map the locations as per different browsers.

Actually I want to run my website project well-arranged on my localhost in Mozilla Firefox, Opera etc. So, that I never get any problem at the time of hosting.


Will you please suggest me step by step process to handle such problem? help me