function contactboxes(show){
    if(show=="bestelling"){
        if(document.getElementById(show).style.display=='none' || document.getElementById(show).style.display==''){
            document.getElementById(show).style.display='block';
        } else {
            document.getElementById(show).style.display='none';
        }
    } else {
        document.getElementById('bestelling').style.display='none';
    }
    if(show=="detail"){
        if(document.getElementById(show).style.display=='none' || document.getElementById(show).style.display==''){
            document.getElementById(show).style.display='block';
        } else {
            document.getElementById(show).style.display='none';
        }
    } else {
        document.getElementById('detail').style.display='none';
    }
    if(show=="ophalen"){
        if(document.getElementById(show).style.display=='none' || document.getElementById(show).style.display==''){
            document.getElementById(show).style.display='block';
        } else {
            document.getElementById(show).style.display='none';
        }
    } else {
        document.getElementById('ophalen').style.display='none';
    }
}