The Results page shipped in PowerStore has the trigger code for the search as:
if ((((isset($_GET["Search"]))?$_GET["Search"]:"") != "")) {
When using an image form element type, the name of the image is not passed, but the x and y coordinates of where the image was passed as "Search_x or "Search_y". to use and image form element, that trigger code would need to be changed to:
if ((((isset($_GET["Search_x"]))?$_GET["Search_x"]:"") != "")) {