function clearfield(formfield)
{
    if(formfield.defaultValue == formfield.value)
    {
        formfield.value = "";
    }
}

function deselect(id)
{
    var obj = document.getElementById(id);
    for (var i = 0; i < obj.options.length; i++)
    {
        obj.options[i].selected = false;
    }
}

function checkFunction(formfield, id)
{
    if(formfield.options[formfield.selectedIndex].value == "Trainer" || formfield.options[formfield.selectedIndex].value == "Hulptrainer" || formfield.options[formfield.selectedIndex].value == "Ploegverantwoordelijke" || formfield.options[formfield.selectedIndex].value == "Bestuurslid" || formfield.options[formfield.selectedIndex].value == "Webmaster" || formfield.options[formfield.selectedIndex].value == "Voorzitter" || formfield.options[formfield.selectedIndex].value == "Secretaris & persverantwoordelijke" || formfield.options[formfield.selectedIndex].value == "Sportief verantwoordelijke" || formfield.options[formfield.selectedIndex].value == "Penningmeester" || formfield.options[formfield.selectedIndex].value == "")
    {
        document.getElementById(id).disabled = true;
        document.getElementById(id).style.background = "#ededed";
    }
    else
    {
        document.getElementById(id).disabled = false;
        document.getElementById(id).style.background = "#ffffff";
    }
}