function verifyform()
{
	var obj=document.getElementById('form_offerus');
	if ( !obj ) return false;
	
	if ( obj.nombre.value == '' )
	{
		alert( cMustInformAllData );
		obj.nombre.focus();
		return false;
	}
	if ( obj.email.value == '' &&  obj.phone.value == '' )
	{
		alert( cMustInformAllData );
		obj.email.focus();
		return false;
	}	
	if ( obj.comentarios.value == '' )
	{
		alert( cMustInformAllData );
		obj.comentarios.focus();
		return false;
	}
	return true;
}