// copyright 2002-3 hesketh.com/inc. all rights reserved
var currentSlide = 0;
var lastSlide = 1;

function hide(what) {
 var a;
 if(document.getElementById) {
  a = document.getElementById(what);
 } else {
  a = eval("document."+what);
 }
 a.style["visibility"] = "hidden";
}

function show(what) {
 var a;
 if(document.getElementById) {
  a = document.getElementById(what);
 } else {
  a = eval("document."+what);
 }
 a.style["visibility"] = "visible";
}

function setup_clocnav() {
 var s, n, f;
 var o;
 if(document.getElementById) {
  n = document.getElementById("currentlocnav");
  s = document.getElementById("clocnav");
  f = document.forms["clocform"];
  for (var x = 1; x <= lastSlide; x++) {
   if(navigator.userAgent.indexOf("MSIE") != -1) {
    s.innerHTML += '<option value="'+x+'">'+x+'</option>';
   } else {
    o = document.createElement("option");
    o.setAttribute("value", ''+x);
    o.innerHTML = x;
    s.appendChild(o);
   }
  }
 }
}

function set_current_location(i) {
 var c;
 if(document.getElementById) {
  c = document.getElementById("currentlocation");
//  n = document.getElementById("currentlocnav");
 } else {
  c = document.currentlocation;
//  n = document.currentlocnav;
 }
 c.innerHTML = "slide "+currentSlide+" of "+lastSlide;
 if(currentSlide > 0) {
  c.style["visibility"] = "visible";
//  n.style["visibility"] = "visible";  
 } else {
  c.style["visibility"] = "hidden";
//  n.style["visibility"] = "hidden";
 }
}

function flip(which) {
 if((which == "next") && (currentSlide < lastSlide)) {
  hide("slide"+currentSlide);
  if(currentSlide == 0) {
    hide("navnexttitle");
    show("navprev");
    show("navnext");
  } else if(currentSlide == (lastSlide -1)) {
    show("navprev");
    hide("navnext");
  }
  show("slide"+(++currentSlide));
 } else if((which == "prev") && (currentSlide > 0)) {
  hide("slide"+currentSlide);
  if(currentSlide == 1) {
    show("navnexttitle");
    hide("navprev");
    hide("navnext");
  } else if(currentSlide <= lastSlide) {
    show("navprev");
    show("navnext");
  }
  show("slide"+(--currentSlide));
 }
 set_current_location();
}

var imgdir              = 'images/';
var nextarrow           = 'navclicknext.gif';
var nextarrowhover      = 'navclicknext-hover.gif';
var prevarrow           = 'navclickprev.gif';
var prevarrowhover      = 'navclickprev-hover.gif';
var transnextarrow      = 'navclicknext-trans.gif';
var transnextarrowhover = 'navclicknext-hover-t.gif';

function hover_on(which) {
 if(document.getElementById) {
  var y = document.getElementById(which+"arrow");
  y.setAttribute("src", imgdir+eval(which+"arrowhover"));
 } else {
  var y = eval("document."+which+"arrow.src = "+which+"arrowhover");
 }
}

function hover_off(which) {
 if(document.getElementById) {
  var z = document.getElementById(which+"arrow");
  z.setAttribute("src", imgdir+eval(which+"arrow"));
 } else {
  var z = eval("document."+which+"arrow.src = "+which+"arrow");
 }
}

function set_current_loc(f) {
 var currentOption = f.clocnav.options[f.clocnav.selectedIndex].value;
 currentSlide = currentOption-1;
 flip("next");
}