var form = document.getElementById('userinput');
form.onsubmit = submit;

var selects = form.getElementsByTagName('select');
for (i = 0; i < selects.length; i++) {
    selects[i].onchange = selectchange;
}


var inputs = form.getElementsByTagName('input');
for (i = 0; i < inputs.length; i++) {
    var inputtype = inputs[i].type;
    if (inputtype == 'submit') {
        var submitbutton = inputs[i]

    }
    else if (inputtype == 'text') {
        inputs[i].onblur = inputblur;
    }
    else if (inputtype == 'radio') {
        inputs[i].onclick = radioclick;
    }
    else if (inputtype == 'checkbox') {
        inputs[i].onclick = radioclick;
    }

}