var isExtended = 0;

function SlideSideBar(event) {

    var sideBar = $('sideBarContents');

    if (isExtended == 0) {
        new Effect.Appear(sideBar, { duration: 0.2, from: 0, to: 1.0 });
        isExtended++;
    }
    else {
        new Effect.Appear(sideBar, { duration: 0.2, from: 1.0, to: 0 });
        isExtended = 0;
	}
}

function Init() {
    $('sideBarContents').hide();
    Event.observe('sideBar', 'click', SlideSideBar, true);
}

Event.observe(window, 'load', Init, true);