function show() {

    document.getElementById("showItems").className = "selected";
    document.getElementById("hideItems").className = "unselected";

    if (navigator.userAgent.indexOf('Internet Explorer')) {
        isIE = true
    };


    var x = [];
    var listItems = [];


    if (isIE) {

        // Search for all <TR>
        var trs = document.getElementsByTagName('tr');
        for (var i = 0; i < trs.length; i++) {
            if (trs.item(i).getAttribute('name') == 'zak') {
                x.push(trs.item(i));
            }
        }
        // Search for all <LI>
        var trs = document.getElementsByTagName('li');
        for (var i = 0; i < trs.length; i++) {
            if (trs.item(i).getAttribute('name') == 'zak2') {
                listItems.push(trs.item(i));
            }
        }
        // Search for all <TABLE>
        var trs = document.getElementsByTagName('table');
        for (var i = 0; i < trs.length; i++) {
            if (trs.item(i).getAttribute('name') == 'zak') {
                x.push(trs.item(i));
            }
        }

    }
    else {
        x = document.getElementsByName("zak");
    }

    var items = x.length;
    for (var i = 0; i != items; i++) {
        x[i].setAttribute('style', 'display: ');
    }

    for (var i = 0; i != listItems.length; i++) {
        listItems[i].className = "";
    }


}

function hide() {
    document.getElementById("showItems").className = "unselected";
    document.getElementById("hideItems").className = "selected";

    if (navigator.userAgent.indexOf('Internet Explorer')) {
        isIE = true
    };


    var x = [];
    var listItems = [];

    if (isIE) {

        // Search for all <TR>
        var trs = document.getElementsByTagName('tr');
        for (var i = 0; i < trs.length; i++) {
            if (trs.item(i).getAttribute('name') == 'zak') {
                x.push(trs.item(i));
            }
        }
        // Search for all <LI>
        var trs = document.getElementsByTagName('li');
        for (var i = 0; i < trs.length; i++) {
            if (trs.item(i).getAttribute('name') == 'zak2') {
                listItems.push(trs.item(i));
            }
        }
        // Search for all <TABLE>
        var trs = document.getElementsByTagName('table');
        for (var i = 0; i < trs.length; i++) {
            if (trs.item(i).getAttribute('name') == 'zak') {
                x.push(trs.item(i));
            }
        }
        
    }
    else {
        x = document.getElementsByName("zak");
        listItems = document.getElemetsByName("zak2");
    }
    var items = x.length;
    for (var i = 0; i != items; i++) {
        x[i].setAttribute('style', 'display: none');
    }

    for (var i = 0; i != listItems.length; i++) {
        listItems[i].className = "zak2";
    }
}