It should be possible if you have the map images for sure. Your code would look something like this:
Code:
if(file_exists("/pathto/mapimages/".$Server['MissionFile'].".jpg")) {
echo "<img src=\"/pathto/mapimages/".$Server['MissionFile'].".jpg\" />";
} else {
echo "<img src=\"/pathto/mapimages/nophoto.jpg\" />";
}
$Server['MissionFile'] should be something like mapname.bms so just name your jpg files mapname.bms.jpg