function showDiv(id)
{

    var divKell = document.getElementById(id);
    var divLogin = document.getElementById('login_div');
    var divRegis = document.getElementById('register_div');

    if (divKell.style.display == 'block')
    {
        divKell.style.display = 'none';
    }
    else
    {
        
        if (id=='login_div') divRegis.style.display = 'none';
        if (id=='register_div') divLogin.style.display = 'none';

        divKell.style.display = 'block';
    }
}