function Validar()
{
	if (sTrimLimpiar(document.frmcontactar.nombre.value) == "")
	{
		alert("Please complete the contact name field.");
		document.frmcontactar.nombre.focus();
		return;
	}
	else
	{
		if (!isNaN(sTrimLimpiar(document.frmcontactar.nombre.value))) {
		alert("Error, in the contact name text filed, does not allow only numerical characters.");
		document.frmcontactar.nombre.focus();
		return;
		}
	}
	
	if (sTrimLimpiar(document.frmcontactar.apellidos.value) == "")
	{
		alert("Please complete the last name text field.");
		document.frmcontactar.apellidos.focus();
		return;
	}
	else
	{
		if (!isNaN(sTrimLimpiar(document.frmcontactar.apellidos.value))) {
		alert("Error, in the last name text field, does not allow only numerical characters.");
		document.frmcontactar.apellidos.focus();
		return;
		}
	}
	
	if (sTrimLimpiar(document.frmcontactar.direccion.value) != "")
	{
		if (!isNaN(sTrimLimpiar(document.frmcontactar.direccion.value))) {
		alert("Error, in the address text field, does not allow only numerical characters.");
		document.frmcontactar.direccion.focus();
		return;
		}
	}

	if (sTrimLimpiar(document.frmcontactar.telefono.value)!="")
	{
		if (document.frmcontactar.telefono.value.length < 9)
		{
			alert("Error, the telephone field, does not have a correct value.");
			document.frmcontactar.telefono.focus();
			return;
		}
		else
		{
			if (isNaN(sTrimLimpiar(document.frmcontactar.telefono.value)))
			{
				alert("Error, the telephone field should be numerical.");
				document.frmcontactar.telefono.focus();
				return;
			}
		}
	}
	
	if (sTrimLimpiar(document.frmcontactar.telefonomovil.value)!="")
	{
		if (document.frmcontactar.telefonomovil.value.length < 9)
		{
			alert("Error, the mobile phone field, does not have a correct value.");
			document.frmcontactar.telefonomovil.focus();
			return;
		}
		else
		{
			if (isNaN(sTrimLimpiar(document.frmcontactar.telefonomovil.value)))
			{
				alert("Error, the mobile phone field should be numerical");
				document.frmcontactar.telefonomovil.focus();
				return;
			}
		}
	}
	
	if (sTrimLimpiar(document.frmcontactar.email.value)!="")
	{
		campoemail = sTrimLimpiar(document.frmcontactar.email.value);
		if (!emailOK(campoemail)) 
		{
			alert ("Error, the email field does not have the correct format ");
			document.frmcontactar.email.focus();
			return;
		}
	}
	
	if (sTrimLimpiar(document.frmcontactar.mensaje.value) == "")
	{
		alert("Please complete the message text field.");
		document.frmcontactar.mensaje.focus();
		return;
	}
	
	document.frmcontactar.submit();
}