function ShowHide(id) {
    if ($get(id).style.display == 'block'){
        $get(id).style.display = 'none';
    }
    else {
        $get(id).style.display = 'block';
    }
}

function ToggleElement(id, dur) {
    element = $(id);
    new Effect.toggle(element, 'Blind', { duration: dur });
}

function SwitchBool(id) {
    if ($get(id).value == 'False') {
        $get(id).value = 'True';
    }
    else {
        $get(id).value = 'False';
    }
}

function brojiznakove(textarea, long) {
    var maxlength = new Number(long); // Change number to your max length.
    if (textarea.value.length > maxlength) {
        textarea.value = textarea.value.substring(0, maxlength);
        alert(" Samo " + long + " znakova!");
    }
    $get('broj').value = textarea.value.length; 
}