Compatibility with different browsers for frames

Hi,

I am writing a web application using Perl CGI. And I have defined an frame within like this

"<iframe id=\"iframe01\" name=\"iframe01\" height=480 width=800 frameborder=0 scrolling=no></iframe>"

My problem is that this iframe appears differently on different browsers - IE6, IE7, Mozilla 2 and Mozilla 3. When I redirect the output of a particular operation into this iframe, on some browsers, the iframe reduces to a small window and doesn't stay at the defined size.

How do I get over this problem?

Regards,
garric