window.addEvent('domready', function(){

    if ($('gallery')) {
    var shadow = new Fx.Slide('shadow', {mode: 'horizontal'});          
    var shadowOp = new Fx.Style('shadow', 'opacity');
    
    shadow.hide();
    shadow.toggle();
    shadowOp.start(0, 0.7);

    $('toggle').addEvent('click', function(e){
		e = new Event(e);	
		if (shadow.wrapper.offsetWidth == 0){ //if the slider is closed
			shadowOp.start(0, 0.7);
			$('toggleImg').setProperty('src', 'img/minus.gif');
		}
		else { //else if it's open
			shadowOp.start(0.7, 0);
			$('toggleImg').setProperty('src', 'img/plus.gif');
		}
		shadow.toggle();
		e.stop();
	});
	
    }
    
});