function alternate(id){ 
	if(document.getElementsByTagName){ 
		var table = document.getElementById(id); 
		var rows = table.getElementsByTagName("tr"); 
		for(i = 0; i < rows.length; i++){ 
			if(i % 2 == 0){ 
				rows[i].className = "odd"; 
			}
			else { 
				rows[i].className = "even"; 
			} 
		} 
	} 
}