var Shake = new Class({
Implements:Options,
options:{
distance: 3,
duration: 50,
transition: Fx.Transitions.Sine.easeInOut,
loops: 15
},

initialize:function(element,options){
this.setOptions(options);
this.element=$(element);
this.tween = new Fx.Tween(this.element,{
link: 'chain',
duration: this.options.duration,
transition: this.options.transition
});
},

shake:function(){
var d=this.options.distance;
var im = this.element.getStyle('margin-left');
temp = new Array();
temp = im.split('px');
im = temp[0];
pos_pos = parseInt(im)+d;
pos_neg = parseInt(im)-d;
for(x=0;x<this.options.loops;x++) this.tween.start('margin-left',pos_pos).start('margin-left',pos_neg);
this.tween.start('margin-left',pos_pos).start('margin-left',im);
}

});