function shows()
{
    var shengs11 = document.getElementById('sheng').value;
    var shis = document.getElementById('shi').value;
    for(var i = 0; i < document.getElementById('province').length; i++)
    {
        
        if(document.getElementById('province').options[i].text == shengs11)
        {
            document.getElementById('province').selectedIndex = i;
            change(1);
            break;
        }
    }
    for(var i = 0; i < document.getElementById('city').length; i++)
    {
        if(document.getElementById('city').options[i].text == shis)
        {
            document.getElementById('city').selectedIndex = i;
            break;
        }
    }
}