php - show image background 1 if div is on the left and show background 2 if image is on the right? -

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hi wonder if can help, not entirely sure possible have div container called <div class="scroll">

inside div scroll sql query echoes comments posted users database. div scroll set width of 600px , comments arranged in div left right, theres 2 comment boxes on each line, each comment box under 300px each align next each other.

the comments listed so:

<div class="scroll">  comment 1 | comment 2 comment 3 | comment 4 comment 5 | comment 6 </div>

the comments encased in div "comment_box"

now have done put background image div "comment_box" image pointer arrow points left , positioned on left hand side of div, want have second background image comment boxes align on right, in instance comments 2, 4 , 6 have different background image/an arrow points right on right hand side of div.

is possible?

thanks

comment box{  .wall_post_case_branch {     background-image:url(../img/effects/arrow_left.png);     background-repeat:no-repeat;     background-position: center;     height:90px;     width:290px;     position:relative;         border:#ccc 1px solid;   }  mysql:  <?php     if(mysql_num_rows($wallposts_set) > 0) {         while ($posts = mysql_fetch_array($wallposts_set)) {             $age = days_from_date($posts['date_added']);             ?>             <div class="comment_box">              <?php echo "{$posts['content']}"; ?>              </div>

you can below.

<?php     $i = 0;     while ($posts = mysql_fetch_array($wallposts_set))     {         $class = ' odd';         if ($i++ % 2 == 0)         {             $class = ' even';         }         echo '<div class="comment_box'.$class.'">';     } ?>

and in css

.odd { background-image:imageone.jpg; } .even{ background-image:imagesecond.jpg; }

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