Java EE (Java Enterprise Edition) General Discussion

I am new to jsp programming. I have no idea how to navigate if there is two dropdownlist. Here second one depends on the first one then should i have to design two pages with sam dessign?

I have checked the url
http://forum.java.sun.com/editwatches!default.jspa

thsi page contains two comboboxes. I have selected java essentials from first combo. Then it got redirected to another page.
with the url
http://forum.java.sun.com/editwatches!default.jspa?filterCat=5

When I checked the view source of http://forum.java.sun.com/editwatches!default.jspa

I have seen something like this...

<select name="filterForum"

onchange="location.href='editwatches!default.jspa?filterForum='+this.options[this.selectedIndex].value+'&filterCat='+this.form.filterCat.options[this.form.filterCat.selectedIndex].value;">

In the above code what do they mean by location?

Please reply me

Thanks in advance