toogle class

function toggleClassName(el, name) {
    var deleted = false;
    var aClasses = el.className.split(' ');
    for (var i = 0; !deleted && i < aClasses.length; ++i) {
        if (aClasses[i] == name) {
            delete(aClasses[i]); 
            deleted = true; 
        }
    }
    if (!deleted) aClasses[aClasses.length] = name;
    el.className = aClasses.join(' ');
}