/**
* correctZIndex 
* @author beijingren<beijingren at vip.qq.com>
* @copyright (c) 2010 www.joyfulboy.cn
*/

var correctZIndex = function() {
    var B = function(ua) {
        var b = {
            msie: /msie/.test(ua) && !/opera/.test(ua),
            opera: /opera/.test(ua),
            safari: /webkit/.test(ua) && !/chrome/.test(ua),
            firefox: /firefox/.test(ua),
            chrome: /chrome/.test(ua)
        };
        var vMark = "";
        for (var i in b) {
            if (b[i]) { vMark = "safari" == i ? "version" : i; break; }
        }
        b.version = vMark && RegExp("(?:" + vMark + ")[\\/: ]([\\d.]+)").test(ua) ? RegExp.$1 : "0";
        b.ie = b.msie;
        b.ie6 = b.msie && parseInt(b.version, 10) == 6;
        b.ie7 = b.msie && parseInt(b.version, 10) == 7;
        b.ie8 = b.msie && parseInt(b.version, 10) == 8;
        return b;
    } (window.navigator.userAgent.toLowerCase());
    function show() {
    	for (var i = 0, d = document.getElementsByTagName("select"); i < d.length; i++) {
            if (B.ie6) {
                d[i].style.visibility = "visible";
            }
        }
        return true;
    }
    function hide() {
        for (var i = 0, d = document.getElementsByTagName("select"); i < d.length; i++) {
            if (B.ie6) {
                d[i].style.visibility = "hidden";
            }
        }
        return true;
    }
    return {
        hide: hide,
        show: show
    }
} ();