function changeText(whichDiv) {
	if (!document.getElementById) return false;
	if (!document.getElementById(whichDiv)) return false;
	var div1 = document.getElementById("text1");
	var div2 = document.getElementById("understanding");
	var div3 = document.getElementById("identifying");
	var div4 = document.getElementById("designing");

	div1.style.visibility = "hidden";
	div2.style.visibility = "hidden";
	div3.style.visibility = "hidden";
	div4.style.visibility = "hidden";

	var showDiv = document.getElementById(whichDiv);
	showDiv.style.visibility = "visible";
}

function changeImage(whichDiv) {
    if (!document.getElementById) return false;
    if (!document.getElementById(whichDiv)) return false;
    if (!document.getElementById(currentImage)) return false;
    var div1 = document.getElementById(currentImage);

    div1.style.visibility = "hidden";

    var showDiv = document.getElementById(whichDiv);
    showDiv.style.visibility = "visible";

    currentImage = whichDiv;
}

function fisherYates(myArray, fade, length) {
    var i = myArray.length;
    if (i == 0) return false;
    while (--i) {
        var j = Math.floor(Math.random() * (i + 1));
        var tempi = myArray[i];
        var tempj = myArray[j];
        myArray[i] = tempj;
        myArray[j] = tempi;
    }

    var cf = new Crossfader(myArray, fade, length);
}