function setview(ViewID){

var displayitem = document.getElementById('tabitems');
var displayitems = displayitem.childNodes;
var i = 0;

        while(i <= displayitems.length){
                tab = displayitems[i];
                //alert(tab+' - '+tab.getAttribute('id')+' == '+ViewID);
                if(tab.getAttribute('id') == ViewID){
                //alert(tab+' - '+tab.getAttribute('id')+' == '+ViewID);
                        tab.setAttribute('class', 'viewtab');
                }else{
                        tab.setAttribute('class', 'hidetab');
                }
                i++;
        }
}

IE outputs:

Error: tab is null of not an object


HTML is:

<div id="tabitems">
<div id="AccountDetails">
</div>
<div id="ServiceDetails">
</div>

</div>