```
<form method="get" action="<?php echo $_SERVER['PHP_SELF']?>">

<h3>Select your product and click submit</h3><br />

<select name="prod">

<option value="default">Select your product</option>

<option value="os">Operating Systems</option>

<option value="mobile">Smart Mobiles</option>

<option value="mobile">Computers</option>

<option value="shirt">Shirts</option>

</select><br /><br />

<input type="submit" value="Submit" name="submit"/>

</form>

```