function check_send()
{
	var ok_to_send = true;
	
	with (document.forms.ContactForm)
	{
	  if (txtName.value == "")
		{
			alert("Please enter your name.");
			txtName.focus();
			ok_to_send = false;
		}
		else if (txtTelephone.value == "")
		{
			alert("Please enter your contact telephone number.");
			txtTelephone.focus();
			ok_to_send = false;
		}
			return ok_to_send;
	}
}