Change Image Using Onchange....

This is the PHP script.... PHP Code:

echo ("<select name="Select" size="1" style="font:&#3910;'">");
    echo ("<option name="topicimage">$iconimg</option>");
    $handle=opendir('images/icons/');
    while (false !== ($file = readdir($handle)))
    {
        if ($file != "." && $file != ".." && $file != "$iconimg")
        {
            echo ("<option name="topicimage">$file</option>
<br>");
        }
    }
    closedir($handle);
    echo ("</select>");

...and i was hoping someone could tell me how i could make the following work. This script basically reads the files from a given folder (images/icons/) and lists them in an drop down box. Now i want to display the image if a user selects one and have it right next to the drop down list.