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			$subSelect = "SELECT image_id,image_tag from imagetags where image_id = '$img_image_id'";
			
			$resultSub = mysql_query($subSelect) or die(mysql_error());
			
			$subArray  = array();
			$tagValue  = '';
			
			while($rowSub = mysql_fetch_assoc($resultSub))
				$subArray[] = $rowSub;
                        }	
			
                        for( $i= 0; $i< sizeof($subArray); $i++ ) {

			  foreach ($subArray[$i] as $subValue) {
				$tagValue = $tagvalue." ,".$subValue;
			 }
                          $imageTags[$subArray[$i]['image_id']][] = $tagValue;
                       }
                        
                       
//

The above will give you a mutlidemnsional array that looks like, assuming the image_id = 1
$imageTags[1][0] = dog
$imageTags[1][1] = white
$imageTags[1][2] = short hair
etc