为什么这个JS在火狐里还是不起作用啊？高手帮帮忙啊

<script language=javascript>
function secBoard(n)
{
var menus = document.getElementById('jfdh_menu');
var mains = document.getElementById('jfdh_display');



for(i=0;i<menus.childNodes.length;i++){
if(menus.childNodes[i].nodeType==1)

menus.childNodes[i].className="button_jfgl";
menus.childNodes[n].className="button_jfgl_1";}

for(i=0;i<mains.childNodes.length;i++){
if(mains.childNodes[i].nodeType==1)

mains.childNodes[i].style.display="none";
mains.childNodes[n].style.display="block";}

}
</script>





在IE就正常的


[解决办法]

JScript code

            function secBoard(n){                var menus_childs = document.getElementById('jfdh_menu').children,                    mains_childs = document.getElementById('jfdh_display').children;                                for(var i=0;i<menus_childs.length;i++){                    menus_childs[i].className="button_jfgl";                }                menus_childs[n].className="button_jfgl_1";                                for(var i=0;i<mains_childs.length;i++){                    mains_childs[i].style.display="none";                }                mains_childs[n].style.display="block";            }