Select Box to display either All Records or Specific One

[saadshams]

<select name="countryID">

<option value="%">All</option>

<option value="1">USA</option>

<option value="2">Canada</option>

<option value="3">Germany</option>

</select>

 

I want the action page to display Either

1) All Cities of All Countries

OR

2) Cities of a Specific Country

 

I could tackle the problem by manually handling the code but trying to find a solution through Dreamweaver Server Behaviors (optionally a bit of manual handcoding). Any idea