function esBlanco(campo){if(campo.length==0||campo==null)return true;}
function esEmail(email){var unEmail=/(((\w|-)+)\@((((\w|-)+)\.)+)(\w+))/;if(unEmail.test(email))return true;else return false;}
function tieneEspacios(q){for(i=0;i<q.length;i++){if(q.charAt(i)==" ")return true}return false}
function alfanumerico(q){var c=/^([a-z]|[0-9])+$/i; if(c.test(q))return true;else return false}
function soloEspacios(q){for(i=0;i<q.length;i++){if(q.charAt(i)!=" ")return false}return true}

function onEnter( evt, frm ) {
	var keyCode = null;
	if( evt.which ) {
		keyCode = evt.which;
	} 
	else if( evt.keyCode ) {
		keyCode = evt.keyCode;
	}
	if( 13 == keyCode ) {
		validar();
		return false;
	}
	return true;
}