function animation(obj){if(this==window){return new animation(obj);}else{this.obj=obj;this._reset_state();this.queue=[];}}
animation.resolution=20;animation.offset=0;animation.prototype._reset_state=function(){this.state={attrs:{},duration:500}}
animation.prototype._build_container=function(){if(this.container_div){this._refresh_container();return;}
var container=document.createElement('div');container.style.padding='0px';container.style.margin='0px';container.style.border='0px';var children=this.obj.childNodes;while(children.length){container.appendChild(children[0]);}
this.obj.appendChild(container);this.obj.style.overflow='hidden';this.container_div=container;this._refresh_container();}
animation.prototype._refresh_container=function(){this.container_div.style.height='auto';this.container_div.style.width='auto';this.container_div.style.height=this.container_div.offsetHeight+'px';this.container_div.style.width=this.container_div.offsetWidth+'px';}
animation.prototype._destroy_container=function(){if(!this.container_div){return;}
var children=this.container_div.childNodes;while(children.length){this.obj.appendChild(children[0]);}
this.obj.removeChild(this.container_div);this.container_div=null;}
animation.ATTR_TO=1;animation.ATTR_BY=2;animation.ATTR_FROM=3;animation.prototype._attr=function(attr,value,mode){var auto=false;switch(attr){case'background':this._attr('backgroundColor',value,mode);return this;case'margin':value=animation.parse_group(value);this.attr('marginBottom',value[0],mode);this.attr('marginLeft',value[1],mode);this.attr('marginRight',value[2],mode);this.attr('marginTop',value[3],mode);return this;case'padding':value=animation.parse_group(value);this.attr('paddingBottom',value[0],mode);this.attr('paddingLeft',value[1],mode);this.attr('paddingRight',value[2],mode);this.attr('paddingTop',value[3],mode);return this;case'backgroundColor':case'borderColor':case'color':value=animation.parse_color(value);break;case'opacity':value=parseFloat(value,10);break;case'height':case'width':if(value=='auto'){auto=true;}else{value=parseInt(value);}
break;case'borderWidth':case'lineHeight':case'fontSize':case'marginBottom':case'marginLeft':case'marginRight':case'marginTop':case'paddingBottom':case'paddingLeft':case'paddingRight':case'paddingTop':case'bottom':case'left':case'right':case'top':case'scrollTop':case'scrollLeft':value=parseInt(value,10);break;default:throw a+' is not a supported attribute!';break;}
if(this.state.attrs[attr]===undefined){this.state.attrs[attr]={};}
if(auto){this.state.attrs[attr].auto=true;}
switch(mode){case animation.ATTR_FROM:this.state.attrs[attr].start=value;break;case animation.ATTR_BY:this.state.attrs[attr].by=true;case animation.ATTR_TO:this.state.attrs[attr].value=value;break;}}
animation.prototype.to=function(attr,value){this._attr(attr,value,animation.ATTR_TO);return this;}
animation.prototype.by=function(attr,value){this._attr(attr,value,animation.ATTR_BY);return this;}
animation.prototype.from=function(attr,value){this._attr(attr,value,animation.ATTR_FROM);return this;}
animation.prototype.duration=function(duration){this.state.duration=duration?duration:0;return this;}
animation.prototype.checkpoint=function(distance,callback){if(distance===undefined){distance=1;}
this.state.checkpoint=distance;this.state.checkpointcb=callback;this.queue.push(this.state);this._reset_state();return this;}
animation.prototype.blind=function(){this.state.blind=true;return this;}
animation.prototype.hide=function(){this.state.hide=true;return this;}
animation.prototype.show=function(){this.state.show=true;return this;}
animation.prototype.ease=function(ease){this.state.ease=ease;return this;}
animation.prototype.go=function(){var time=(new Date()).getTime();this.queue.push(this.state);for(var i=0;i<this.queue.length;i++){this.queue[i].start=time-animation.offset;if(this.queue[i].checkpoint){time+=this.queue[i].checkpoint*this.queue[i].duration;}}
animation.push(this);return this;}
animation.prototype._frame=function(time){var done=true;var still_needs_container=false;var blake_ross=false;for(var i=0;i<this.queue.length;i++){var cur=this.queue[i];if(cur.start>time){done=false;continue;}else if(cur.checkpointcb&&(cur.checkpoint*cur.duration+cur.start>time)){this._callback(cur.checkpointcb,time-cur.start-cur.checkpoint*cur.duration);cur.checkpointcb=null;}
if(cur.started===undefined){if(cur.show){this.obj.style.display='block';}
for(var a in cur.attrs){if(cur.attrs[a].start!==undefined){continue;}
switch(a){case'backgroundColor':case'borderColor':case'color':var val=animation.parse_color(get_style(this.obj,a=='borderColor'?'borderLeftColor':a));if(cur.attrs[a].by){cur.attrs[a].value[0]=Math.min(255,Math.max(0,cur.attrs[a].value[0]+val[0]));cur.attrs[a].value[1]=Math.min(255,Math.max(0,cur.attrs[a].value[1]+val[1]));cur.attrs[a].value[2]=Math.min(255,Math.max(0,cur.attrs[a].value[2]+val[2]));}
break;case'opacity':var val=get_opacity(this.obj);if(cur.attrs[a].by){cur.attrs[a].value=Math.min(1,Math.max(0,cur.attrs[a].value+val));}
break;case'height':case'width':var val=animation['get_'+a](this.obj);if(cur.attrs[a].by){cur.attrs[a].value+=val;}
break;case'scrollLeft':case'scrollTop':var val=(this.obj==document.body?(document.documentElement||document.body):this.obj)[a];if(cur.attrs[a].by){cur.attrs[a].value+=val;}
cur['last'+a]=val;break;default:var val=parseInt(get_style(this.obj,a),10);if(cur.attrs[a].by){cur.attrs[a].value+=val;}
break;}
cur.attrs[a].start=val;}
if((cur.attrs.height&&cur.attrs.height.auto)||(cur.attrs.width&&cur.attrs.width.auto)){if(ua.firefox()<3){blake_ross=true;}
this._destroy_container();for(var a in{height:1,width:1,fontSize:1,borderLeftWidth:1,borderRightWidth:1,borderTopWidth:1,borderBottomWidth:1,paddingLeft:1,paddingRight:1,paddingTop:1,paddingBottom:1}){if(cur.attrs[a]){this.obj.style[a]=cur.attrs[a].value+(typeof cur.attrs[a].value=='number'?'px':'');}}
if(cur.attrs.height&&cur.attrs.height.auto){cur.attrs.height.value=animation.get_height(this.obj);}
if(cur.attrs.width&&cur.attrs.width.auto){cur.attrs.width.value=animation.get_width(this.obj);}}
cur.started=true;if(cur.blind){this._build_container();}}
var p=(time-cur.start)/cur.duration;if(p>=1){p=1;if(cur.hide){this.obj.style.display='none';}}else{done=false;}
if(cur.ease){p=cur.ease(p);}
if(!still_needs_container&&p!=1&&cur.blind){still_needs_container=true;}
if(blake_ross&&this.obj.parentNode){var parentNode=this.obj.parentNode;var nextChild=this.obj.nextSibling;parentNode.removeChild(this.obj);}
for(var a in cur.attrs){switch(a){case'backgroundColor':case'borderColor':case'color':this.obj.style[a]='rgb('+
animation.calc_tween(p,cur.attrs[a].start[0],cur.attrs[a].value[0],true)+','+
animation.calc_tween(p,cur.attrs[a].start[1],cur.attrs[a].value[1],true)+','+
animation.calc_tween(p,cur.attrs[a].start[2],cur.attrs[a].value[2],true)+')';break;case'opacity':set_opacity(this.obj,animation.calc_tween(p,cur.attrs[a].start,cur.attrs[a].value));break;case'height':case'width':this.obj.style[a]=p==1&&cur.attrs[a].auto?'auto':animation.calc_tween(p,cur.attrs[a].start,cur.attrs[a].value,true)+'px';break;case'scrollLeft':case'scrollTop':var val=this.obj==document.body?document.documentElement[a]||document.body[a]:this.obj[a];if(cur['last'+a]!=val){delete cur.attrs[a];}else{var diff=animation.calc_tween(p,cur.attrs[a].start,cur.attrs[a].value,true)-val;if(a=='scrollLeft'){window.scrollBy(diff,0);}else{window.scrollBy(0,diff);}
cur['last'+a]=diff+val;}
break;default:this.obj.style[a]=animation.calc_tween(p,cur.attrs[a].start,cur.attrs[a].value,true)+'px';break;}}
if(p==1){this.queue.splice(i--,1);this._callback(cur.ondone,time-cur.start-cur.duration);}}
if(blake_ross){parentNode[nextChild?'insertBefore':'appendChild'](this.obj,nextChild);}
if(!still_needs_container&&this.container_div){this._destroy_container();}
return!done;}
animation.prototype.ondone=function(fn){this.state.ondone=fn;return this;}
animation.prototype._callback=function(callback,offset){if(callback){animation.offset=offset;callback.call(this);animation.offset=0;}}
animation.calc_tween=function(p,v1,v2,whole){return(whole?parseInt:parseFloat)((v2-v1)*p+v1,10);}
animation.parse_color=function(color){var hex=/^#([a-f0-9]{1,2})([a-f0-9]{1,2})([a-f0-9]{1,2})$/i.exec(color);if(hex){return[parseInt(hex[1].length==1?hex[1]+hex[1]:hex[1],16),parseInt(hex[2].length==1?hex[2]+hex[2]:hex[2],16),parseInt(hex[3].length==1?hex[3]+hex[3]:hex[3],16)];}else{var rgb=/^rgba? *\(([0-9]+), *([0-9]+), *([0-9]+)(?:, *([0-9]+))?\)$/.exec(color);if(rgb){if(rgb[4]==='0'){return[255,255,255];}else{return[parseInt(rgb[1],10),parseInt(rgb[2],10),parseInt(rgb[3],10)];}}else if(color=='transparent'){return[255,255,255];}else{throw'Named color attributes are not supported.';}}}
animation.parse_group=function(value){var value=trim(value).split(/ +/);if(value.length==4){return value;}else if(value.length==3){return[value[0],value[1],value[2],value[1]];}else if(value.length==2){return[value[0],value[1],value[0],value[1]];}else{return[value[0],value[0],value[0],value[0]];}}
animation.get_height=function(obj){var pT=parseInt(get_style(obj,'paddingTop'),10),pB=parseInt(get_style(obj,'paddingBottom'),10),bT=parseInt(get_style(obj,'borderTopWidth'),10),bW=parseInt(get_style(obj,'borderBottomWidth'),10);return obj.offsetHeight-(pT?pT:0)-(pB?pB:0)-(bT?bT:0)-(bW?bW:0);}
animation.get_width=function(obj){var pL=parseInt(get_style(obj,'paddingLeft'),10),pR=parseInt(get_style(obj,'paddingRight'),10),bL=parseInt(get_style(obj,'borderLeftWidth'),10),bR=parseInt(get_style(obj,'borderRightWidth'),10);return obj.offsetWidth-(pL?pL:0)-(pR?pR:0)-(bL?bL:0)-(bR?bR:0);}
animation.push=function(instance){if(!animation.active){animation.active=[];}
animation.active.push(instance);if(!animation.timeout){animation.timeout=setInterval(animation.animate.bind(animation),animation.resolution);}}
animation.animate=function(){var done=true;var time=(new Date()).getTime();for(var i=0;i<animation.active.length;i++){if(animation.active[i]._frame(time)){done=false;}else{animation.active.splice(i--,1);}}
if(done){clearInterval(animation.timeout);animation.timeout=null;}}
animation.ease={}
animation.ease.begin=function(p){return p*p;}
animation.ease.end=function(p){p-=1;return-(p*p)+1;}
animation.ease.both=function(p){if(p<=0.5){return(p*p)*2;}else{p-=1;return(p*p)*-2+1;}}