//※板块分层显示代码开始※
function tabit(btn){
	var idname = new String(btn.id);
	var s = idname.indexOf("_");  //取出idname中"_"的位置：int
	var e = idname.lastIndexOf("_")+1; //返回整个idname 中最后一个匹配项的从零开始的索引
	var tabName = idname.substr(0, s);
	var id = parseInt(idname.substr(e, 1));
	var tabNumber = btn.parentNode.childNodes.length+3;
	for(i=0;i<tabNumber;i++)
	    {
            document.getElementById(tabName+"_div_"+i).style.display = "none"; 
		    document.getElementById(tabName+"_bt_"+i).className = "xbt_bj";

        
		};		
		document.getElementById(tabName+"_div_"+id).style.display = "block";
		btn.className = "xbt_bj_over";

}
//※板块分层显示代码结束※