function check(img_element, checkbox_id) {
    img_element.src     = img_element.src.replace('check_off.aspx', 'check_on.aspx');
    img_element.onclick = function() { unCheck(img_element, checkbox_id); }
    document.getElementById(checkbox_id).checked = "checked";
    
}
function unCheck(img_element, checkbox_id) {
    img_element.src     = img_element.src.replace('check_on.aspx', 'check_off.aspx');
    img_element.onclick = function() { check(img_element, checkbox_id); }
    document.getElementById(checkbox_id).checked = "";
}

function showById(element_id, type_in, show_style) {
    try {
        hideById(type_in);
    } catch (Error) { }
    var next_el = document.getElementById(element_id);
    next_el.style.display = show_style;
    next_el.setAttribute('orig', next_el.id);
    next_el.id = type_in;
}
function hideById(type_in) {
    try {
        var current_el = document.getElementById(type_in);
        current_el.style.display = "none";
        current_el.id = current_el.getAttribute('orig');
    } catch (Error) { }
}


/*Functions for Top menu - No longer needed*/
/*
function highlightButton(element_in) {
    element_in.childNodes[0].className = element_in.childNodes[0].className.replace(" img_selected", "") + " img_selected";
    element_in.childNodes[0].src = element_in.childNodes[0].src.replace("_selected", "").replace(".aspx", "_selected.aspx");
}
function normaliseButton(element_in) {
    element_in.childNodes[0].src = element_in.childNodes[0].src.replace("_selected", "");
    element_in.childNodes[0].className = element_in.childNodes[0].className.replace(" img_selected", "");
}
*/