How to find browser compability

[Guvera]

Hi friends,

I create a design in asp.net using HTML and JavaScript.I run the code in IE.But my client ask to run the code in Opera and FireBox,IE.I run the code the design is well in IE.But When i run the same script and Code,lot of changes in the design,while the output is appeared in the browser.

I think that this is browser compability.But i dont know how to design the page for other browser.If anyone knows send some suggestion.

Hope for help

Thanks

Failing to plan is plannign to fail

[mendhak]

But When i run the same script and Code,lot of changes in the design,while the output is appeared in the browser.

Explain that.