function validar_login(){
		var login = document.getElementById('login').value
		var senha = document.getElementById('senha').value
		var ajax_chk_login = new sack();																		

		ajax_chk_login.setVar( 'login', login );
		ajax_chk_login.setVar( 'senha', senha );		

		ajax_chk_login.requestFile  = "./login/validar_login.php";
		ajax_chk_login.onCompletion = function(){ eval(ajax_chk_login.response) };
		ajax_chk_login.runAJAX();								
		
	}