<!--
function validar_form() {
  validity = true;
  	
  if (!check_empty(document.contacto.email.value))
  	{ validity = false; alert('INGRESAR EMAIL');}
  
  if (!check_email(document.contacto.email.value))
  	{ validity = false; alert('EMAIL INCORRECTO'); }

  if (validity)
  return validity;
}

function check_empty(text) {
if(text.length == 0||text==""){return false}else{return true}
}

function check_email(address) {
  if ((address == "")
    || (address.indexOf ('@') == -1)
    || (address.indexOf ('.') == -1))
      return false;
  return true;
}

function envia(){
var isok=validar_form()
	if (isok){
		document.contacto.submit()
	}
}
// -->