// tab

function tabChange(tabNo) {
    var i, x = document.getElementById("tabChanger").getElementsByTagName("li");
    for (i = 1; i <= x.length; i++) {
    document.getElementById("tabBtn" + i).className = "set";
    document.getElementById("tab" + i).className = "subBtn";
    }
    document.getElementById("tabBtn" + tabNo).className = "set selected";
    document.getElementById("tab" + tabNo).className = "mainBtn";
}