function close1() {
 this.document.getElementById("fenster1").style.visibility = "hidden";
}

function open1() {
 this.document.getElementById("fenster1").style.visibility = "visible";
}


function close2() {
 this.document.getElementById("fenster2").style.visibility = "hidden";
}

function open2() {
 this.document.getElementById("fenster2").style.visibility = "visible";
}


function close3() {
 this.document.getElementById("fenster3").style.visibility = "hidden";
}

function open3() {
 this.document.getElementById("fenster3").style.visibility = "visible";
}


function close4() {
 this.document.getElementById("fenster4").style.visibility = "hidden";
}

function open4() {
 this.document.getElementById("fenster4").style.visibility = "visible";
}


function close5() {
 this.document.getElementById("fenster5").style.visibility = "hidden";
}

function open5() {
 this.document.getElementById("fenster5").style.visibility = "visible";
}


function close6() {
 this.document.getElementById("fenster6").style.visibility = "hidden";
}

function open6() {
 this.document.getElementById("fenster6").style.visibility = "visible";
}


function close7() {
 this.document.getElementById("fenster7").style.visibility = "hidden";
}

function open7() {
 this.document.getElementById("fenster7").style.visibility = "visible";
}


function close8() {
 this.document.getElementById("fenster8").style.visibility = "hidden";
}

function open8() {
 this.document.getElementById("fenster8").style.visibility = "visible";
}