browser comatibility issue

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ASP.NET

hello sir,
i make a website in asp.net using vb.net.
my problem is if i opened my website in IE then it looks fine.but when i open it in mozilla firefox and other browser its not looks fine.i for this issue i add the code in website's web.config file and also in machine web.config file as well bt still there is same problem.

the code is as follows..........................................

<!-- GECKO Based Browsers (Netscape 6+, Mozilla/Firebird, ...) //-->
<case match="^Mozilla/5\.0 \([^)]*\) (Gecko/[-\d]+)?
(?'type'[^/\d]*)([\d]*)/(?'version'(?'major'\d+)(?'minor'\.\d+)(?'letters' \w*)).*">
browser=Gecko
type=${type}
frames=true
tables=true
cookies=true
javascript=true
javaapplets=true
ecmascriptversion=1.5
w3cdomversion=1.0
css1=true
css2=true
xml=true
tagwriter=System.Web.UI.HtmlTextWriter
<case
match="rv?'version'(?'major'\d+)(?'minor'\.\d+)( ?'letters'\w*))">
version=${version}
majorversion=${major}
minorversion=${minor}
<case match="^b" with="${letters}">
beta=true
</case>
</case>
</case>
<!-- AppleWebKit Based Browsers (Safari...) //-->
<case
match="AppleWebKit/(?'version'(?'major'\d)(?'minor'\d+)(?'letters'\w* ))">
browser=AppleWebKit
version=${version}
majorversion=${major}
minorversion=0.${minor}
frames=true
tables=true
cookies=true
javascript=true
javaapplets=true
ecmascriptversion=1.5
w3cdomversion=1.0
css1=true
css2=true
xml=true
tagwriter=System.Web.UI.HtmlTextWriter
<case
match="AppleWebKit/(?'version'(?'major'\d)(?'minor'\d+)(?'letters'\w* ))(
\(KHTML, like Gecko\) )?(?'type'[^/\d]*)/.*$">
type=${type}
</case>
</case>
<!-- Konqueror //-->
<case
match="Konqueror/(?'version'(?'major'\d+)(?'minor'\.\d+)(?'letters' ));\w*(?'platform'[^\)]*)">
browser=Konqueror
version=${version}
majorversion=${major}
minorversion=${minor}
platform=${platform}
type=Konqueror
frames=true
tables=true
cookies=true
javascript=true
javaapplets=true
ecmascriptversion=1.5
w3cdomversion=1.0
css1=true
css2=true
xml=true
tagwriter=System.Web.UI.HtmlTextWriter
</case>
<!-- OPERA 5+ //-->
<case match="Opera[
/](?'version'(?'major'\d+)(?'minor'\.\d+)(?'letters' \w*))">
browser=Opera
type=${type}
frames=true
tables=true
cookies=true
javascript=true
javaapplets=true
ecmascriptversion=1.5
w3cdomversion=1.0
css1=true
css2=true
xml=true
tagwriter=System.Web.UI.HtmlTextWriter
<case
match="rv?'version'(?'major'\d+)(?'minor'\.\d+)( ?'letters'\w*))">
version=${version}
majorversion=${major}
minorversion=${minor}
<case match="^b" with="${letters}">
beta=true
</case>
</case>
</case>
</browserCaps>


please help me out what should i do for this problem

thanks and regard

subiya