function exist(id){
    var s=document.getElementById(id);
    if(s){return true}
    else{return false}
   }



function changetab(btnid,tabid,tabnumber,c)
{
	
	if (exist(tabid+"_btn0"))
	{
		document.getElementById(tabid+"_btn0").className = "b1_off";
	}
	
	for (i = 0;i<=tabnumber;i++)
	{
	if (i>0)
	{
	document.getElementById(tabid+"_btn"+i).className = c+"_off";
	
	}
	document.getElementById(tabid+"_con"+i).style.display = "none";
	}

	document.getElementById(tabid+"_btn"+btnid).className= c+"_on";
	document.getElementById(tabid+"_con"+btnid).style.display = "block";
}


////以下参数请勿修改
//try{ 
//var marqueesHeight2 = 18; //高度
//var stopscroll2    = false; 
//var scrollElem2 =  document.getElementById("scrolllayer2"); 
//with(scrollElem2){ 
//style.width    = 739;//宽度 
//style.height    = marqueesHeight2; 
//style.overflow  = 'hidden'; 
//noWrap          = true; 
//} 
//scrollElem2.onmouseover = new  Function('stopscroll2 = true'); 
//scrollElem2.onmouseout  = new  Function('stopscroll2 = false'); 
//var preTop2    = 0; 
//var currentTop2 = 0; 
//var stoptime2  = 0; 
//var leftElem2 =  document.getElementById("scrollmessage2"); 
//scrollElem2.appendChild(leftElem2.cloneNode(true)); 
//init_srolltext2(); 
//}catch(e) {} 
//function init_srolltext2(){ 
//scrollElem2.scrollTop = 0; 
//setInterval('scrollUp2()', 15); //滚动速度
//} 
//function scrollUp2(){ 
//if(stopscroll2) return; 
//currentTop2 += 1; 
//if(currentTop2 == 21) { //滚动距离
//stoptime2 += 1; 
//currentTop2 -= 1; 
//if(stoptime2 == 220) { //停顿时间
//currentTop2 = 0; 
//stoptime2 = 0; 
//} 
//}else{ 
//preTop2 = scrollElem2.scrollTop; 
//scrollElem2.scrollTop += 1; 
//if(preTop2 == scrollElem2.scrollTop){ 
//scrollElem2.scrollTop = 0; 
//scrollElem2.scrollTop += 1; 
//} 
//} 
//}