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();
}