//选择器
function $a(id, tag) { var re = (id && typeof id != "string") ? id : document.getElementById(id); if (!tag) { return re; } else { return re.getElementsByTagName(tag); } }
//首页下拉菜单
function ShowList(id, vas) {
    var zj = $a(id), mb = $a(id, "dt")[0], xs = $a(id, "dd")[0], sj = $a(xs, "li"); if (vas != null) { var va = $a(vas); }
    mb.onclick = function() { xs.className = "show"; };
    zj.onmouseout = function() { xs.className = ""; };
    xs.onmouseover = function() { xs.className = "show"; };
    xs.onclick = function() { xs.className = ""; }
    for (var i = 0; i < sj.length; i++) { reg(i); }
    function reg(i) {
        sj[i]["onmouseover"] = function() { sj[i].className = "show"; if (vas) { va.value = mb.innerHTML = sj[i].innerHTML; } else { mb.innerHTML = $a(sj[i], "a")[0].innerHTML; } }
        sj[i]["onmouseout"] = function() { sj[i].className = ""; };
    }
}

//点击框文字消失
function clickInput(id, str) { var o = $a(id); o.value = str; o.onclick = function() { this.focus(); if (this.value == str) { this.value = ""; } }; o.onmouseout = function() { if (this.value == "") { this.value = str; } } }