Zoom to custom extent - PHP

[Kevin Grootendorst]

Bill,
Thanks for the direction.  I'm still a little stuck.  Just to clarify, I
have the following code:

----------
In my app_contents.php file:

<SELECT NAME="ViewRegion">
<OPTION VALUE="7120999 827999 7599999 1119999">Lake Ontario</OPTION>
<OPTION VALUE="7200000 833270 7291840 894520">Niagara (ON)</OPTION>
<OPTION VALUE="7150000 878000 7210000 880000">Hamilton-Wentworth</OPTION>
</SELECT >

----------
In my app.php file:

(the code that you provided)
// check if quick zoom is requested
if ( isset( $http_form_vars['ViewRegion'] ) && strlen($http_form_vars
['ViewRegion'] ) > 0 )
{
    // separate values
    $adExtents = explode( ',', $http_form_vars['ViewRegion'] );

    // set extent
    $oMapSession->oMap->setExtent( $adExtents[0], $adExtents[1],$adExtents
[2], $adExtents[3] );
}
-----------

This isn't quite working yet, but is this really all the code I'll need?
Should my drop-down box be set as a form?
Thanks again for your help - this has been very frustrating.

Kevin