function validateValues(what) {
    var valid = true;
        
    var checkBoxes = false;
    var checkboxChecked = false;
        
    var radioButtons = false;
    var radioChecked = false;
        
    for (var i=0, j=what.elements.length; i<j; i++) {
        myType = what.elements[i].type;
        if (myType == 'radio') {
            radioButtons = true;
           if (what.elements[i].checked) radioChecked = true;
        }
        if (myType == 'checkbox') {
            checkBoxes = true;
            if (what.elements[i].checked) checkboxChecked = true;
        }
        if (myType == 'password' || myType == 'text' || myType == 'textarea')
            if (what.elements[i].value == what.elements[i].defaultValue) valid = false;
        if (myType == 'select-one' || myType == 'select-multiple')
            if (what.elements[i].selectedIndex == 0) valid = false;
    }

    if ((checkBoxes && !checkboxChecked) || (radioButtons && !radioChecked)) valid = false;

    if (!valid)
        alert('Form not completely filled');

    return valid;
}