JavaScript不支持IE6,请高手帮忙看看,thank you

Question

function rankwarp(id,ele,elename,elechild,start_ele,cur_ele){ 
    var obj_id=document.getElementById(id); 
    var obj_ele=tag(obj_id,ele); 
    for(i=0;i<obj_ele.length;i++){ 
        if(obj_ele[i].className.indexOf(elename) == -1) continue; 
        var objlist=tag(obj_ele[i],elechild); 
        for(j=0;j<objlist.length;j++){ 
            objlist[j].onmouseover=function(){ 
                var paris=this.parentNode; 
                var list=tag(paris,elechild); 
                for(x=0;x<list.length;x++){ 
                    var thisdiv=tag(list[x],cur_ele)[0]; 
                    var thisp=tag(list[x],start_ele)[0]; 
                    thisdiv.style.display="none"; 
                    thisp.style.display="block"; 
                    } 
                var start=tag(this,start_ele)[0]; 
                start.style.display='none'; 
                var cur=tag(this,cur_ele)[0]; 
                cur.style.display='block'; 
            } 
        } 
    } 
} 
function tag(obj_id,tag){return obj_id.getElementsByTagName(tag);} 
setTimeout("rankwarp('rankwarp','ul','ranklist','li','p','div')",0);