document.observe('dom:loaded', function () {
    $('itemDisplayList').observe('click', changeItemDisplay.curry('listItemDisplay'));
    $('itemDisplayGrid').observe('click', changeItemDisplay.curry('gridItemDisplay'));

});

function changeItemDisplay(engine, event) {
    Event.stop(event);

    new Ajax.Request('action.php?what=itemdisplay', {method: 'post', onComplete: reloadWindow, parameters: {display: engine}});
}