function OnExpanderClick(divId)
{
    var divElem = document.getElementById('leftnavdiv_'+divId);
    var spanExpander = document.getElementById('leftnavexp_'+divId);

    if (divElem.style.display == 'none') {
        divElem.style.display = 'inline';
        if (spanExpander != null && spanExpander != 'undefined') {   
            spanExpander.src = '/REPSuite/static/collapse_menu/arrow_down.gif';
        }
    }
    else if (divElem.style.display == 'inline') {
        divElem.style.display = 'none';
        if (spanExpander != null && spanExpander != 'undefined') {
            spanExpander.src = '/REPSuite/static/collapse_menu/arrow_right.gif';
        }
    }
}