var commonJS = {

	addEvent: function(obj,type,fn) {

		if (obj.addEventListener) {
			obj.addEventListener(type,fn,false);
			return true;
		} else if (obj.attachEvent) {
			obj['e'+type+fn] = fn;
			obj[type+fn] = function() { obj['e'+type+fn]( window.event );}
			var r = obj.attachEvent('on'+type, obj[type+fn]);
			return r;
		} else {
			obj['on'+type] = fn;
			return true;
		}

	},

	stripe: function(tbIndex) {

		var tRows = document.getElementById('sample').getElementsByTagName('tr');

		// var i=0 for odd rows
		// var i=1 for even rows
		for (var i=0, thisRow; thisRow=tRows[i]; i+=2) { // increment by 2
			thisRow.className += (thisRow.className) ? ' even' : 'even';
		}

	}

}

commonJS.addEvent(window,'load',commonJS.stripe);