function CheckContactForm()
{    	
    if (!CheckField('sender', /.{2,}/))
    {
        return false;
    }
      
    if (!CheckField('phone', /[0-9 \+\(\)]{6,}/))
    {
        return false;
    }
      
	if (!CheckField('email', /.{3,}@.{3,}\..{2,}/))
    {
        return false;
    }

    if (!CheckField('interest', /.{6,}/))
    {
        return false;
    }

    document.contactform.submit();
}