Element.implement({

beat : function(radius,rate){

radius = radius || 2;

rate = rate || 70;

duration = (60000/(4*rate)).toInt();

var parent = this.getParent();

if(parent != $(document.body) && parent.getStyle('position')=='static'){

parent.setStyle('position','relative');

}

var position = this.getStyle('position');

if(position=='static'){

this.setStyle('position','relative');

position = 'relative';

}

if(Browser.Engine.trident){

parent.setStyle('height',parent.getStyle('height'));

}

var coords = this.getCoordinates(parent);

if(position == 'relative' && !Browser.Engine.presto){

coords.left -= parent.getStyle('paddingLeft').toInt();

coords.top -= parent.getStyle('paddingTop').toInt();

}

this.set('morph',{

link:'chain',

transition:Fx.Transitions.Back.easeOut,

duration:duration

}).store('coords',coords);

var hr = function(){

var coords = this.retrieve('coords');

this.morph({

top: coords.top - radius,

left: coords.left - radius,

width: coords.width + 2*radius,

height : coords.height + 2*radius

}).morph(coords);

};

hr.call(this);

hr.periodical((60000/rate).toInt(),this);

return this;

}

});