// JavaScript Document

function getTablesByClass(classname) {
	var ret = new Array();
	
	var tables = document.getElementsByTagName('table');
	for(i = 0; i < tables.length; i++) {
		if(tables[i].className == classname) {
			ret.push(tables[i]);		
		}
	}
	return ret;
}

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