function classRows() {
	var myTABLES = document.getElementsByTagName('tbody');	//Only cycle through rows in the table body
	for (var x=0;x<myTABLES.length;x++) {
		var myTR = myTABLES[x].getElementsByTagName('tr');
		for (var i=0;i<myTR.length;i++) {
			if (myTR[i].className == '') {		//Only add a class if there isn't already a class
				if (i%2) {
					myTR[i].className = 'even';	//Add even class to even rows
				} else {
					myTR[i].className = 'odd';	//Add odd class to odd rows
				}
			}
		}
	}
}

window.onload=function(){
	classRows();
}