function validar_contacto(form) {

	if (form.nombre.value == '') { alert('Please type your Name.'); form.nombre.focus(); return false; }
	if (form.apellido.value == '') { alert('Please type your Lastname.'); form.apellido.focus(); return false; }
	if (form.email.value.indexOf('@') < 0 || form.email.value.indexOf('.') < 0 || form.email.value.indexOf(',') > 0) { alert('Invalid e-mail address.'); form.email.focus(); return false; }
	if (form.email.value!=form.confirmaremail.value) { alert('Wrong e-mail confirmation.'); form.email.focus(); return false; }
	if (form.asunto.value == '') { alert('Type the subject.'); form.asunto.focus(); return false; }
	if (form.mensaje.value == '') { alert('Type the message.'); form.mensaje.focus(); return false; }

	return true;

}

function validar_signup(form) {

	if (form.nombre.value == '') { alert('Please type your Name.'); form.nombre.focus(); return false; }
	if (form.apellido.value == '') { alert('Please type your Lastname.'); form.apellido.focus(); return false; }
	if (form.email.value.indexOf('@') < 0 || form.email.value.indexOf('.') < 0 || form.email.value.indexOf(',') > 0) { alert('Invalid e-mail address.'); form.email.focus(); return false; }
	if (form.email.value!=form.confirmaremail.value) { alert('Wrong e-mail confirmation.'); form.email.focus(); return false; }

	return true;

}

function send_subject(url,str_subject) {
	objSubject=getObj("asunto");
	if (objSubject==null) {
		location.href=url+"?subject="+str_subject;
	} else {
		objSubject.value=str_subject;
	}
}