var direction='right';
(function(){
    var css={
        'left':'398px'
    };
    if(direction==='right'){
        direction='left';
        css.left=';
    }else{
        direction='right';
    }
    $(,arguments.callee);
})();

<input type="button" class="stop-btn" value="stop" />
<div class="wrap">
	<div class="box">徘徊</div>
</div>