function DecCnt(f){if (f.parentElement.delta.value>1)f.parentElement.delta.value--;}
function IncCnt(f){ f.parentElement.delta.value++; }



      <a href="javascript:void(0);" onclick="DecCnt(this);"><img src="pics/left_arrow.gif" width="4" height="7" alt="-"></a>
      <input type="text" name="delta" class="count_prod_box" value="1" id='count' maxlength='4'>
      <a href="javascript:void(0);" onclick="IncCnt(this);"><img src="pics/right_arrow.gif" width="4" height="7" alt="+"></a>