刚才点站内消息发现的。。。。。。。。。

不问了，搜了下

js弄出来的。。。

document.getElementById().style.  =  ;就单纯这个函数就可以做出这个效果了

function ChangePro(id,thePro,value){
    var obj=document.getElementById(id);
    eval("obj.style."+thePro+"='"+value+"'");
}

//**************************
//lead函数
function LeadClick(n){
    var i;
   // ChangePro("top_lead_"+4,"backgroundColor","#333");
    for(i=1;i<=5;i++){
        ChangePro("top_lead_"+i,"backgroundColor","");
        ChangePro("top_lead_"+i,"border","none");
        ChangePro("sec_lead_"+i,"visibility","hidden");
    }
    ChangePro("top_lead_"+n,"backgroundColor","#333");
    ChangePro("top_lead_"+n,"borderLeft","solid 1px #39f");
    ChangePro("top_lead_"+n,"borderTop","solid 1px #39f");
    ChangePro("top_lead_"+n,"borderRight","solid 1px #39f");
    ChangePro("sec_lead_"+n,"visibility","visible");
        
}
导航效果就出来了

JQuery