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 = "even"; 
     }else{ 
       rows[i].className = "odd"; 
     }}}}