EZ Question

I am including a javascript that makes sure frames are loaded right.
I want to use this code on many different
sites so I need it work with out having to
edit for each site. Here's the code I have
that works fine.

<SCRIPT language="JavaScript">
if (top.document.location != 'http://mysite.com/index.html' ){
top.document.location = 'http://mysite.com/index.html'
}
</SCRIPT>

This is how I would like it to work so that
the URL will not need to be edited for each site.

<SCRIPT language="JavaScript">
if (top.document.location != ( current url ).'index.html' ){
top.document.location = ( current url ).'index.html'
}
</SCRIPT>

Questin is how do I get the current url only?

Thanks Charlie...