function showlist()
{
document.getElementById('dropdown_keuzes').style.visibility= 'visible';
document.getElementById('dropdown').style.background= 'url(http://www.dagaanbiedingen.nl/img/pagebar_dropdown_act.png)';
document.getElementById('dropdown').style.color= '#FFFFFF';
}

function closelist()
{
document.getElementById('dropdown_keuzes').style.visibility= 'hidden';
document.getElementById('dropdown').style.background= 'url(http://www.dagaanbiedingen.nl/img/pagebar_dropdown.png)';
document.getElementById('dropdown').style.color= '#000000';
}