/*
This is assuming your DB tables are setup similar to this:

//Image Caption Table
image_id
caption


//Image Title Table
image_id
title

// image_id must be the same value in both tables per image
*/

while( $imageRow = mysql_fetch_assoc($imgResult) ) {
  $data[$imageRow['image_id']]['caption'] = $imageRow['caption'];
}

while( $row = mysql_fetch_assoc($result) ) {
  $data[$row['image_id']]['title'] = $row['title'];
}


foreach( $data as $singleElement ) {
   echo $singleElement['title'] . "<br />";
   echo $singleElement['caption'] . "<br />";
}