function timertab(tabid,totaltab,s){ 
   this.start = s;//初始项目 
   this.speed = 20000;//切换间隔 
   this.setid = null;//定时器 
   var loop = function(){ //自动切换 
		  for(var j=1;j<=totaltab;j++){
			if (j != start)
			{
				$(tabid+ "_title" + j).className= tabid+"_normal";
				$(tabid+ "_content" + j).className= "hiddencontent";
			}
			else
			{
			   $(tabid+ "_title" + j).className= tabid+"_active";
			   $(tabid+ "_content" + j).className= "activecontent";
			}			
		}
		//alert(start+"   "+totaltab);
		setid=setTimeout(loop,speed);//开始自动切换 
		start++; 
       if(start>totaltab){ 
           start=1; 
       }
   };loop(); 
   var clik = function(){ //点击 
       for(var i=1;i<=totaltab;i++){ 
           $(tabid+ "_title" + i).onclick = function(){ 
               clearTimeout(setid);//停止原来的自动切换
			   var strtitle = this.getAttribute("id");
			   var strcontent = strtitle.replace("title","content");
			   var inb = strtitle.substring(strtitle.length,strtitle.length-1);
				for(var j=1;j<=totaltab;j++){
						$(tabid+ "_title" + j).className= tabid+ "_normal";
						$(tabid+ "_content" + j).className= "hiddencontent";	
				}
				$(strtitle).className = tabid+"_active" ;
				$(strcontent).className = "activecontent" ;
				//this.className = tabid+"_active"; 
               /*从点击项开始自动切换，此功能可以选择去掉*/ 
               start=inb; 
               loop(); 
           } 
       } 
   };clik(); 
   var m_over = function(){//鼠标指向暂停自动切换 
       for(var i=1;i<=totaltab;i++){ 
           $(tabid+ "_content" + i).onmouseover = function(){clearTimeout(setid)}; 
       } 
   };m_over(); 
   var m_out = function(){//鼠标离开继续自动切换 
       for(var i=1;i<=totaltab;i++){ 
           $(tabid+ "_content" + i).onmouseout = function(){setid=setTimeout(loop,speed)}; 
       } 
   };m_out(); 
} 

//切换
function tabchange(tabid,tabNumber,totaltab){
	for(var j=1;j<=totaltab;j++){
		if (j != tabNumber)
		{
			$(tabid+ "_title" + j).className= tabid+"_normal";
			$(tabid+ "_content" + j).className= "hiddencontent";
		}
		else
		{
		   $(tabid+ "_title" + j).className= tabid+"_active";
		   $(tabid+ "_content" + j).className= "activecontent";
		}			
	}
}