var Tween=(function(){function constructor(obj,property,oHeight,fHeight,time,units){this.obj=obj;this.property=property;this.oh=oHeight;this.fh=fHeight;this.intervalRate=10;this.position=0;this.steps=Math.round(time/this.intervalRate);this.units=units;this.d;this.playing=null;this.ease="easeSin"}function easeSin(instance){return(Math.sin((instance.position/instance.steps)*Math.PI/2)*(instance.fh-instance.oh)+instance.oh)}function startInterval(instance){instance.playing=setInterval(function(){instance.animate()},instance.intervalRate)}constructor.prototype.play=function(){if(this.position==0){this.stop();this.d=1;startInterval(this)}else{if(this.position==this.steps){this.stop();this.d=-1;startInterval(this)}}};constructor.prototype.stop=function(){clearInterval(this.playing);this.playing=null};constructor.prototype.animate=function(d){this.position+=this.d;this.obj.style[this.property]=(eval(this.ease))(this)+this.units;if(this.position==this.steps||this.position==0){this.stop()}};return constructor})();