function SY_slider()
{this.recordCount=0;this.elm=null;this.current=0;this.direction=-1;this.stepItemCount=3;this.itemWidth=0;this.visibleCount=0;this.firstSlide=true;this.stepTime=60;this.stepCount=10;this.stepAmount=0;this.stepIndex=0;this.totalWidth=0;this.lastestLeft=0;this._automaticStepTime=8000;this._automaticTimer=null;this.name='';this.goStatus=true;this.timerIndex=null;this._start=_start;this._action=_action;this._clear=_clear;this._go=_go;this.go=go;this._automatic=_automatic;this._clearAutomaticTimer=_clearAutomaticTimer;this._checkStatus=_checkStatus;function _start()
{if(!this.elm)
return false;tmp=this.elm.getElementsByTagName('div');for(i=0;i<tmp.length;i++)
{if(tmp[i].className=='SY_slider_item')
{this.recordCount+=1;this.itemWidth=tmp[i].offsetWidth;}}
this.visibleCount=parseInt(this.elm.offsetWidth/this.itemWidth)*1;this.totalWidth=this.itemWidth*this.recordCount;this.stepAmount=parseInt(this.itemWidth/this.stepCount);this.lastestLeft=document.getElementById(this.elm.id+"_"+(this.recordCount-1)).offsetLeft;}
function _action()
{if(!this.recordCount)
return false;else if(this.visibleCount>=this.recordCount)
return false;this._automatic();}
function _go()
{this.stepIndex++;if(this.stepIndex==this.stepCount)
{_step=this.itemWidth-(this.stepCount*this.stepAmount)+this.stepAmount;}
else
{_step=this.stepAmount;}
_step=_step*this.stepItemCount;for(i=0;i<this.recordCount;i++)
{tmp=document.getElementById(this.elm.id+"_"+i).offsetLeft+_step*this.direction;if(tmp>this.lastestLeft)
{tmp=_step-this.itemWidth;}
document.getElementById(this.elm.id+"_"+i).style.left=tmp+"px";}
if(this.stepIndex==this.stepCount)
{this._clear();}
else
{this.timerIndex=setTimeout(this.name+"._go();",this.stepTime);}}
function go(direction,automatic)
{if(!this.goStatus)
return;if(!automatic){this._clearAutomaticTimer();}
if(this.current+direction>0)
return false;if((this.recordCount-this.visibleCount)<Math.abs(this.current+direction))
return false;this.goStatus=false;this.direction=direction;this.current+=direction*this.stepItemCount;this._go();}
function _clear()
{this.stepIndex=0;if(this.timerIndex!=null)
clearTimeout(this.timerIndex);this.timerIndex=null;this.goStatus=true;}
function _clearAutomaticTimer()
{if(this._automaticTimer!=null)
clearTimeout(this._automaticTimer);this._automaticTimer=null;}
function _automatic(){if(this.firstSlide)
{var temp=setTimeout("this.go(this.direction, 1)",this._automaticStepTime);clearTimeout(temp);this.firstSlide=false;}
else
{this._checkStatus();this.go(this.direction,1);}
this._automaticTimer=setTimeout(this.name+"._automatic();",this._automaticStepTime);}
function _checkStatus()
{var index=this.recordCount-this.visibleCount;if(this.current==-(index))
this.direction=1;else if(this.current==0)
this.direction=-1;}}