php to change select box option
===

I am using php and trying to change a option using php my code looks like this:

    <?php
    $ProductName = 'test2';
    ?>
    
    <select id="product" name="product" value=<? echo $ProductName; ?> >
       <option value="test1">Option 1</option>
       <option value="test2">Option 2</option>
       <option value="test3">Option 3</option>
       <option value="test4">Option 4</option>
    </select>

however the above does not change the option.

any Ideas?