var changing = false;

function swtichElement(element, parent){
    if(!changing){
        changing = true;
        if($('element_' + element)){
            if(!$('element_' + element).visible()){
                $$('a.element_link_' + parent).invoke('removeClassName', 'sel');
                $('elements_' + parent).select('div.element').invoke('hide');
                $('element_link_' + element).addClassName('sel');
                $('element_' + element).appear({ duration:.35, afterFinish:function(){ changing = false; } });
            } else {
                changing = false;
            }
        }
    }
    return false;
}