/* Presentation Slide Controller.  Written by Joe McCormack. */
function slideForward() {
document.getElementById("slide" + currentSlide + "_Header").style.display = "none";
document.getElementById("slide" + currentSlide + "_Body").style.display = "none";
currentSlide = currentSlide + 1;
if (currentSlide > numberSlides) { currentSlide = 1; }
document.getElementById("slide" + currentSlide + "_Header").style.display = "block";
document.getElementById("slide" + currentSlide + "_Body").style.display = "block";
}
function slideBackward() {
document.getElementById("slide" + currentSlide + "_Header").style.display = "none";
document.getElementById("slide" + currentSlide + "_Body").style.display = "none";
currentSlide = currentSlide - 1;
if (currentSlide < 1) { currentSlide = numberSlides; }
document.getElementById("slide" + currentSlide + "_Header").style.display = "block";
document.getElementById("slide" + currentSlide + "_Body").style.display = "block";
}
function slideStart() {
document.getElementById("slide" + currentSlide + "_Header").style.display = "none";
document.getElementById("slide" + currentSlide + "_Body").style.display = "none";
currentSlide = 1;
document.getElementById("slide" + currentSlide + "_Header").style.display = "block";
document.getElementById("slide" + currentSlide + "_Body").style.display = "block";
}
function slideEnd() {
document.getElementById("slide" + currentSlide + "_Header").style.display = "none";
document.getElementById("slide" + currentSlide + "_Body").style.display = "none";
currentSlide = numberSlides;
document.getElementById("slide" + currentSlide + "_Header").style.display = "block";
document.getElementById("slide" + currentSlide + "_Body").style.display = "block";
}
function wkeyboard(e) {
var code; if (!e) { code = window.event.keyCode; } else { code = e.which; }
if (code == 13 || code == 38 || code == 39) { slideForward(); } // enter key or up key or forward key -- move forward in presentation
if (code == 40 || code == 37 || code == 8) { slideBackward(); } // down key or backward key or backspace key -- move back in presentation
if (code == 36) { slideStart(); } // home key -- move to beginning of presentation
if (code == 35) { slideEnd(); } // end key - move to end of presentation
}
document.onkeydown = wkeyboard;