// 判断不同的浏览器
var agt=navigator.userAgent.toLowerCase();
var is_ie=(agt.indexOf("msie")!=-1 && document.all);



//首页导航切换_多个栏目/

function bgswitch01(td,objtab)
{
  var tr = td.parentElement.cells;
  var ob = document.getElementById(objtab).rows;
  for(var ii=0; ii<tr.length-0; ii++)
  {
    tr[ii].className = (td.cellIndex==ii)?"on1":"off1";
    ob[ii].style.display = (td.cellIndex==ii)?"block":"none";
  }
}

//首页内容块切换2/

function bgswitch02(td,objtab,objtab02)
{
//  var tr = td.parentElement.cells;
  var tr;
  if (is_ie) {
	tr = td.parentElement.cells;	  
  } else
  { tr = td.parentNode.cells; }
  
  var ob = document.getElementById(objtab).rows;
  var moreob = document.getElementById(objtab02).rows;
  for(var ii=0; ii<tr.length; ii++)
  {
    tr[ii].className = (td.cellIndex==ii)?"on2":"off2";
    ob[ii].style.display = (td.cellIndex==ii)?"block":"none";
	moreob[ii].style.display = (td.cellIndex==ii)?"block":"none";
  }
}