var stripe = function() {
    if (!document.getElementsByTagName || !document.createTextNode) return;
    var even = true;
    var trs = document.getElementsByTagName('tr');      
    for (var i = 0; i < trs.length; i++) {
        if (trs[i].parentNode.nodeName == 'TBODY') {
            trs[i].onmouseover = function(){
                this.className += (!this.className) ? 'ruled' : ' ruled';
            }
            trs[i].onmouseout = function(){
                this.className = this.className.replace(' ruled', '').replace('ruled', '');
            }        
            if(even)
            trs[i].className += (!trs[i].className) ? 'even' : ' even';        
            even = !even;
        }
    }
}

window.onload=stripe;