function changeTab(tab) {
    for (var i = 1; i <= 3; i++) {
        if (i == tab) {
            document.getElementById('tab' + i + 'txt').className = 'show';
            document.getElementById('tab' + i).className = 'botao1';
        } else {
            document.getElementById('tab' + i + 'txt').className = 'hide';
            document.getElementById('tab' + i).className = 'botao0';
        }
    }
}


function checkModules (selected) {
    var i    = 1;
    var last = 0;
    while (true) {
        if (document.getElementById('module_' + i)) {
            last = i;
            i ++;
        } else {
            break;
        }
    }
    
    if (selected != last) {
        document.getElementById('module_' + last).checked = false;
    } else {
        for (i = 1; i < last; i++)
            document.getElementById('module_' + i).checked = false;
    }
}


function hideShow(id) {
    var obj = document.getElementById(id);
    if(obj.className == 'hide')
        obj.className = 'show';
    else
        obj.className = 'hide';
}