var BigNews={
current:0,
next:0,
scrollInterval:0,
autoScroller:0,
smallpic:"SwitchSmaPic"
};
BigNews.turn=function(index,obj){
clearInterval(BigNews.autoScroller);
BigNews.scroll(index,obj);
};
BigNews.scroll=function(index,obj){
if(obj.smallpic==null || obj.smallpic==""){
clearInterval(BigNews.autoScroller);
return;
}
var count=0;
var step=obj.step;
var duration=16;
var b=BigNews;
b.next=index;

if(index==b.current){
return;
}

if(index < SmallNews.current){
SmallNews.go(SmallNews, index);
} else if (index - 2 >= SmallNews.current) {
SmallNews.go(SmallNews, index - 2);
}

clearInterval(b.scrollInterval);
for(var i=0;i<obj.totalcount;i++){
$$(obj.smallpic+"_"+i).className='';
//if(obj.pictxt!=null && obj.pictxt!="")
//$$(obj.pictxt+"_"+i).style.display = "none" ;
}
$$(obj.smallpic+"_"+index).className=obj.selectstyle;
//if(obj.pictxt!=null && obj.pictxt!="")
//$$(obj.pictxt+"_"+index).style.display = "block" ;
var span=index-b.current;
var begin_value=$$(obj.bigpic).scrollTop;
var chang_in_value=span*step+(b.current*step-begin_value);
b.scrollInterval=setInterval(function(){doit(begin_value,chang_in_value)},10);
function doit(b,c){
$$(obj.bigpic).scrollTop=cpu(count,b,c,duration);
count++;
if(count==duration){
clearInterval(BigNews.scrollInterval);
scrollInterval=0;
count=0;
$$(obj.bigpic).scrollTop=b+c;
BigNews.current=index;
}
}
function cpu(t,b,c,d) {return c*((t=t/d-1)*t*t+1)+b;};
};
BigNews.auto=function(obj){
clearInterval(BigNews.autoScroller);
BigNews.autoScroller=setInterval(function(){
BigNews.scroll(BigNews.current==(obj.totalcount-1)?0:BigNews.current+1,obj);
},obj.autotimeintval);
};
BigNews.pauseSwitch = function() {
//clearTimeout(BigNews.autoScroller);
clearInterval(BigNews.autoScroller);
};
BigNews.init=function(obj){
$$(obj.bigpic).onmouseover = new Function("BigNews.pauseSwitch();") ;
$$(obj.bigpic).onmouseout = new Function("BigNews.auto("+obj.objname+");") ;
for (i=0;i<obj.totalcount;i++) {
if(obj.smallpic!=null && obj.smallpic!="") {
$$(obj.smallpic+"_"+i).onmouseover = new Function("BigNews.turn("+i+","+obj.objname+");BigNews.pauseSwitch();") ;
$$(obj.smallpic+"_"+i).onmouseout = new Function("BigNews.auto("+obj.objname+");") ;
//$$(obj.pictxt+"_"+i).onmouseover = new Function("BigNews.pauseSwitch();");
//$$(obj.pictxt+"_"+i).onmouseout = new Function("BigNews.auto("+obj.objname+");");
}
}
BigNews.smallpic = obj.smallpic;
BigNews.auto(obj);
};



var SmallNews = {
current:0,
step:0,
totalcount:0,
a_pre:"",
a_next:"",
ul:'',
clickflag:0
};
SmallNews.init=function(obj) {
SmallNews.step = obj.step;
SmallNews.totalcount = obj.totalcount;
//SmallNews.a_pre = obj.a_pre;
//SmallNews.a_next = obj.a_next;
SmallNews.ul = obj.ul;
};
SmallNews.pre=function(){
if(SmallNews.current<=0){
return;
}else{
var index = SmallNews.current - 1;
if(BigNews.current > index + 2) {
$$(BigNews.smallpic+"_"+ (index + 2)).onmouseover();
$$(BigNews.smallpic+"_"+ (index + 2)).onmouseout();
}
SmallNews.go(SmallNews,SmallNews.current-1);
}
};
SmallNews.next=function(){
if(SmallNews.current>=SmallNews.totalcount - 3){
return;
}else{
var index = SmallNews.current + 1;
if (BigNews.current < index) {
$$(BigNews.smallpic+"_"+index).onmouseover();
$$(BigNews.smallpic+"_"+index).onmouseout();
} 
SmallNews.go(SmallNews,SmallNews.current+1);


}
};
SmallNews.go=function(obj,index){
if(obj.current==index){return;}
var span=-index+obj.current;
if(obj.clickflag > 0){return;}
obj.clickflag=1;
if(obj.step>0)
ScrollCrossUp.scroll($$(obj.ul),obj.step,span,parseInt($$(obj.ul).style.marginTop)||0,cb,10);
else{
cb();
}
function cb(){
obj.current=index;
if(obj.current == 0) {
//$$(obj.a_pre).className = "no-pre";
//$$(obj.a_next).className = "next";
}else if(obj.current > 0 && obj.current < obj.totalcount - 3) {
//$$(obj.a_pre).className = "pre";
//$$(obj.a_next).className = "next";
}else if(obj.current == obj.totalcount - 3) {
//$$(obj.a_pre).className = "pre";
//$$(obj.a_next).className = "no-next";
}
obj.clickflag=0;
}
};

//向上滚动
ScrollCrossUp={interval:0,count:0,duration:0,step:0,srcObj:null,callback:null};
ScrollCrossUp.doit=function(obj,b,c,d){
var s=ScrollCrossUp;
obj.style.marginTop=cpu(s.count,b,c,d)+'px';
s.count++;
if(s.count>=d){
clearInterval(s.interval);
s.count=0;
obj.style.marginTop=b+c+'px';
s.callback();
}
function cpu(t,b,c,d) {return c*((t=t/d-1)*t*t+1)+b;};
};
ScrollCrossUp.scroll=function(obj,step,span,beign,callback,duration){
var s=ScrollCrossUp;
s.duration=duration;
s.callback=callback;
s.interval=setInterval(function(){s.doit(obj,beign,step*span,duration)},10);

};