function next_box(){
		var a = $('slidingpanel').getElementsByClassName('img_box').length;
		var left = parseInt($('slidingpanel').getStyle('left')== null ? 0: $('slidingpanel').getStyle('left'));
		
		//function onclick(event) { next_box(); return false; }
		

		
		if((a-1)*(-570)!= left){
			$('next').onclick = empty;
			window.setTimeout("setOnclickNext()", 1500);

			new Effect.Move('slidingpanel', { x: -570, transition: Effect.Transitions.spring, duration: 1.5 });			
			return false;
		}
		
		return false;
}

function back_box(){
		var a = $('slidingpanel').getElementsByClassName('img_box').length;
		var left = parseInt($('slidingpanel').getStyle('left')== null ? 0: $('slidingpanel').getStyle('left'));

		if( left != 0){
			$('back').onclick = empty;
			window.setTimeout("setOnclickBack()", 1500);
			new Effect.Move('slidingpanel', { x: 570, transition: Effect.Transitions.spring, duration: 1.5 });  return false;
		}
		
		return false;
}

function empty(){ return false;}

function setOnclickNext(){ $('next').onclick = next_box;}

function setOnclickBack(){ $('back').onclick = back_box;}

function setLoader(){ 
	$('loader').show();
	Element.hide.delay(2.5, 'loader');
}