function alternate(id){ 
	 if(document.getElementsByTagName){  
	 	var table = document.getElementById(id);
	 	if (table != null) {   
	 		table.className = "spectable";
	 		var rows = table.getElementsByTagName("tr");   
	 		for(i = 0; i < rows.length; i++){           
	   	//manipulate rows 
	 			if(i % 2 == 0){ 
	 				rows[i].className = "specfontbgwhite"; 
	 			} else { 
	 				rows[i].className = "specfontbgblue"; 
	 			}       
	 		}
	 		
		   	var headers = table.getElementsByTagName("th");
		   	for(i = 0; i < headers.length; i++){           
			   //manipulate headers 
			   headers[i].className = "specheader"; 
			   headers[i].setAttribute("colspan","2");
			}
	 	}
 	} 
}