function popupZon()
{
    this.document.getElementById('popupZon').style.display = "block"
}

function popupZonOut()
{
    this.document.getElementById('popupZon').style.display = "none"
}


function popupIjsvogel()
{
    this.document.getElementById('popupIjsvogel').style.display = "block"
}

function popupIjsvogelOut()
{
    this.document.getElementById('popupIjsvogel').style.display = "none"
}


function popupDocent()
{
    this.document.getElementById('popupDocent').style.display = "block"
}

function popupDocentOut()
{
    this.document.getElementById('popupDocent').style.display = "none"
}


function popupWindmolen()
{
    this.document.getElementById('popupWindmolen').style.display = "block"
}

function popupWindmolenOut()
{
    this.document.getElementById('popupWindmolen').style.display = "none"
}


function popupShell()
{
    this.document.getElementById('popupShell').style.display = "block"
}

function popupShellOut()
{
    this.document.getElementById('popupShell').style.display = "none"
}


function popupAarde()
{
    this.document.getElementById('popupAarde').style.display = "block"
}

function popupAardeOut()
{
    this.document.getElementById('popupAarde').style.display = "none"
}


function popupDocentSub()
{
    this.document.getElementById('popupDocentSub').style.display = "block"
}

function popupDocentSubOut()
{
    this.document.getElementById('popupDocentSub').style.display = "none"
}


function popupIjsvogelSub()
{
    this.document.getElementById('popupIjsvogelSub').style.display = "block"
}

function popupIjsvogelSubOut()
{
    this.document.getElementById('popupIjsvogelSub').style.display = "none"
}