var stripe = function() {
	var tables = document.getElementsByTagName("table");  

	for(var x=0;x < tables.length;x++){
		var table = tables[x];
		if (! table) { return; }

		var even = true;
		var trs = tables[x].getElementsByTagName("tr");
      
		for (var i = 0; i < trs.length; i++) {
			trs[i].onmouseover=function(){
				this.className += " ruled"; return false
			}
			trs[i].onmouseout=function(){
				this.className = this.className.replace("ruled", ""); return false
			}
        
			if(even)
				trs[i].className += " even";
        
			even = !even;
		}
	}
}

window.onload = stripe;