function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function swapOn(imgName) {
  if (document.images) {
    var im = document.getElementById(imgName);
    var path = "images/" + imgName + "_hover.gif";
    im.setAttribute("src",path);    
  }
}

function swapOff(imgName) {
  if (document.images) {
    var im = document.getElementById(imgName);
    var path = "images/" + imgName + ".gif";
    im.setAttribute("src",path);    
  }
}

function showElement(hidden_element) {
    var element = document.getElementById(hidden_element);
    element.style.display = "block";
}

function showAnswer(answer) {
    if (!document.getElementById("answer")){
        var newPara = document.createElement("p"); 
        var newText = document.createTextNode(answer);
        newPara.setAttribute("id","answer");
        newPara.appendChild(newText);
        var quiz = document.getElementById("quizQ");
        quiz.appendChild(newPara);
    }
}

function showSignupForm() {
    var form = document.getElementById("signup");
    var formMask = document.getElementById("signup_mask");
    formMask.style.display = "block";
    var end = 0;
    var start =  parseInt(form.style.bottom);
    form.style.display = "block";
    var t = new Tween(form.style,"bottom",Tween.strongEaseOut,start,end,0.4,"px");
    t.start();
}

function hideSignupForm() {
    var form = document.getElementById("signup");
    var start = parseInt(form.style.bottom);
    var end = -190;
    var t = new Tween(form.style,"bottom",Tween.strongEaseOut,start,end,0.4,"px");
    t.onMotionFinished = stowForm;
    t.start();
}

function stowForm() {
    var formMask = document.getElementById("signup_mask");
    formMask.style.display = "none";
    
}

function showBios() {
    var bios = document.getElementById("staff_bios");
    bios.style.display = "block";
    
}

function hideBios() {
    var bios = document.getElementById("staff_bios");
    bios.style.display = "none";
}

function showTestimonials(cat) {
    var containers = new Array("kidTestimonials","schoolTestimonials","partnerTestimonials","placeholder");
    for(i=0;i<containers.length;i++) {
        var c = document.getElementById(containers[i]);
        c.style.display = "none";
    }
    var test_cat = cat + "Testimonials";
    var tests = document.getElementById(test_cat);
    tests.style.display = "block";
}