function toggleExternSelect() {
    if (document.getElementById("extern").checked == false) {
        document.forms[0].path.disabled = true;
        document.getElementById('text_content').style.display = 'block';
    } else {
        document.forms[0].path.disabled = false;
        document.getElementById('text_content').style.display = 'none';
    }
}

function show_tab(num) {
    var boxes = document.getElementsByTagName('div');
    var count = 0;
    for (var i=0; i < boxes.length; i++) {
        if (boxes[i].id == 'links') {
            if (count == num) {
                boxes[i].style.display = 'inline';
            } else {
                boxes[i].style.display = 'none';
            }
            count++;
        }
    }

    boxes = document.getElementsByTagName('span');
    count = 0;
    for (var i=0; i < boxes.length; i++) {
        if (boxes[i].id == 'header') {
            //alert(boxes[i].className);
            if (count == num) {
                boxes[i].className = 'active';
            } else {
                boxes[i].className = 'inactive';
            }
            count++;
        }
    }
}