function getElementsByClassName(node, classname) {
    var a = [];
    var re = new RegExp('\\b' + classname + '\\b');
    var els = node.getElementsByTagName("*");
    for(var i=0,j=els.length; i<j; i++)
        if(re.test(els[i].className))a.push(els[i]);
    return a;
}

function stripe_rows(className) {
    var tables = getElementsByClassName(document, className);
    for(var j=0; j<tables.length; j++) {
        tbody = tables[j].getElementsByTagName('tbody');
        rows = tbody[0].getElementsByTagName('tr');
        for(var i=0; i<rows.length; i=i+2) {
            rows[i].className = rows[i].className + " odd";
        }
    }
}

window.onload = function() {
	stripe_rows('striped');
}