colorTables = function() {
	var rowEls = document.getElementById("main").getElementsByTagName("TR");
	for (var i=1; i<rowEls.length; i++) {
		if (i % 2) {
			rowEls[i].className+=" odd";
		} else {
			rowEls[i].className+=" even";
		}
	}
}
window.onload = colorTables;