[grima]

<span>
<span class="itogo" value="120">120 руб<input type="checkbox"  /></span>
<span class="itogo" value="123">123 руб<input type="checkbox"  /></span>
<span class="itogo" value="23">23 руб<input type="checkbox"  /></span>
<span class="itogo" value="34">34 руб<input type="checkbox"  /></span>
<span class="itogo" value="45">45 руб<input type="checkbox"  /></span>
<span class="itogo" value="56">56 руб<input type="checkbox"  /></span>
<span class="itogo" value="65">65 руб<input type="checkbox"  /></span>
<span class="itogo" value="76">76 руб<input type="checkbox"  /></span>
<span class="itogo" value="57">57 руб<input type="checkbox"  /></span>

</span>

<div><span id="summa">0</span></div>

<script type="text/javascript">
    function summ(){
 var summ = document.getElementByid("summ");
 var total = 0;
$('.itogo').each(function() {
    total += parseInt($(this).attr('value'));
});
summ.innerhtml = total;
}
 </script>

помогите разобраться