var id = new Array('one', 'two', 'three', 'four');

function displayStuff(d) {

    if (document.getElementById(id[d]).style.display == "") {
        document.getElementById(id[d]).style.display = "block";
        if (d == "0") {
            document.getElementById(id[1]).style.display = "";
            document.getElementById(id[2]).style.display = "";
            document.getElementById(id[3]).style.display = "";
        }
        if (d == "1") {
            document.getElementById(id[0]).style.display = "";
            document.getElementById(id[2]).style.display = "";
            document.getElementById(id[3]).style.display = "";
        }
        if (d == "2") {
            document.getElementById(id[0]).style.display = "";
            document.getElementById(id[1]).style.display = "";
            document.getElementById(id[3]).style.display = "";
        }
        if (d == "3") {
            document.getElementById(id[0]).style.display = "";
            document.getElementById(id[1]).style.display = "";
            document.getElementById(id[2]).style.display = "";
        }
    }

}