function alternate(tableID){
			 if(document.getElementsByTagName){  
			   var table = document.getElementById(tableID);  
			   if (table)
			   {
				   var rows = table.getElementsByTagName("tr");  
				   for(i = 1; i < rows.length; i++){          
				 //manipulate rows
				     if(i % 2 == 0){
				       rows[i].className = "odd";
				     }else{
				       rows[i].className = "even";
				     }      
				   }
				  }
			 }
			}