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// Returns a list of elements of class class_name
function getElementsByClassName(els, class_name) {
    return ch_filter(els, function (el) { return el.getAttribute("class") == class_name ? true : false });
}

// A filter function even IE6 will understand
function ch_filter(a, fn) {
    if(a.filter) return a.filter(fn);
    var r = [];
    for(i = 0; i < a.length; i++)
        if(fn(a[i])) r.push(a[i]);
    return r;
}