function meuProjetor(item) {

    if (item == 1) {
        document.getElementById("frame2").style.visibility = "hidden";
        document.getElementById("frame3").style.visibility = "hidden";
        document.getElementById("frame1").style.visibility = "visible";
        document.getElementById("videoProjetor").style.visibility = "visible";
    }
    else if (item == 2) {
        document.getElementById("videoProjetor").style.visibility = "hidden";
        document.getElementById("frame1").style.visibility = "hidden";
        document.getElementById("frame3").style.visibility = "hidden";
        document.getElementById("frame2").style.visibility = "visible";
    }
    else {
        document.getElementById("videoProjetor").style.visibility = "hidden";
        document.getElementById("frame1").style.visibility = "hidden";
        document.getElementById("frame2").style.visibility = "hidden";
        document.getElementById("frame3").style.visibility = "visible";
    }
}