Filtering XML with XSL

I would like to develop a web site that involve allowing a user to choose a 
value from a combo box and then connect them to a site that filters a xml file 
from which item they have selected.

For Example:
If the user has a combo box with zip codes in it. When they select a zip 
codethey are led to another site that only shows the records with the specified 
zip code.

Can someone point me to the right direction? If someone knows a site that has 
an example like this please let me know.

Thanks,
James

XML Example:
<Addresses>
        <Address>
            <StreetAddress>My Street</StreetAddresss>
            <City>My City</City>
            <State>OHIO</State>
            <Zip>45111</Zip>
        </Address>
        <Address>
            <StreetAddress>My Street 2</StreetAddresss>
            <City>My City 2</City>
            <State>OHIO</State>
            <Zip>45141</Zip>
        </Address>
        <Address>
            <StreetAddress>My Street 3</StreetAddresss>
            <City>My City 3</City>
            <State>OHIO</State>
            <Zip>45211</Zip>
        </Address>
</Addresses>


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list