function moveElement(elementID,final_x,final_y,interval) {
  if (!document.getElementById) return false;
  if (!document.getElementById(elementID)) return false;
  var elem = document.getElementById(elementID);
  if (elem.movement) {
    clearTimeout(elem.movement);
  }
  if (!elem.style.left) {
    elem.style.left = "0px";
  }
  if (!elem.style.top) {
    elem.style.top = "0px";
  }
  var xpos = parseInt(elem.style.left);
  var ypos = parseInt(elem.style.top);
  if (xpos == final_x && ypos == final_y) {
    return true;
  }
  if (xpos < final_x) {
    var dist = Math.ceil((final_x - xpos)/10);
    xpos = xpos + dist;
  }
  if (xpos > final_x) {
    var dist = Math.ceil((xpos - final_x)/10);
    xpos = xpos - dist;
  }
  if (ypos < final_y) {
    var dist = Math.ceil((final_y - ypos)/10);
    ypos = ypos + dist;
  }
  if (ypos > final_y) {
    var dist = Math.ceil((ypos - final_y)/10);
    ypos = ypos - dist;
  }
  elem.style.left = xpos + "px";
  elem.style.top = ypos + "px";
  var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
  elem.movement = setTimeout(repeat,interval);
}

function prepareSlideshow() {
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById) return false;
  if (!document.getElementById("intro")) return false;
  var intro = document.getElementById("intro");
  var slideshow = document.createElement("div");
  slideshow.setAttribute("id","slideshow");
  var frame = document.createElement("img");
  frame.setAttribute("src","images/frame.gif");
  frame.setAttribute("alt","");
  frame.setAttribute("id","frame");
  slideshow.appendChild(frame);
  var preview = document.createElement("img");
  preview.setAttribute("src","images/slideshow.gif");
  preview.setAttribute("alt","a glimpse of what awaits you");
  preview.setAttribute("id","preview");
  slideshow.appendChild(preview);
  insertAfter(slideshow,intro);
  var links = document.getElementsByTagName("a");
  for (var i=0; i<links.length; i++) {
    links[i].onmouseover = function() {
      var destination = this.getAttribute("href");
      if (destination.indexOf("index.html") != -1) {
        moveElement("preview",0,0,5);
      }
      if (destination.indexOf("tree.html") != -1) {
        moveElement("preview",-150,0,5);
      }
      if (destination.indexOf("detection.html") != -1) {
        moveElement("preview",-300,0,5);
      }
      if (destination.indexOf("wood.html") != -1) {
        moveElement("preview",-450,0,5);
      }
      if (destination.indexOf("regen.html") != -1) {
        moveElement("preview",-600,0,5);
      }
	  if (destination.indexOf("onset.html") != -1) {
        moveElement("preview",-750,0,5);
      }
	  if (destination.indexOf("causes.html") != -1) {
        moveElement("preview",-900,0,5);
      }
	  if (destination.indexOf("management.html") != -1) {
        moveElement("preview",-1050,0,5);
      }
    }
  }
}
//the following function is used causes page to check flash version before running video
function MM_CheckFlashVersion(reqVerStr,msg){
  with(navigator){
    var isIE  = (appVersion.indexOf("MSIE") != -1 && userAgent.indexOf("Opera") == -1);
    var isWin = (appVersion.toLowerCase().indexOf("win") != -1);
    if (!isIE || !isWin){  
      var flashVer = -1;
      if (plugins && plugins.length > 0){
        var desc = plugins["Shockwave Flash"] ? plugins["Shockwave Flash"].description : "";
        desc = plugins["Shockwave Flash 2.0"] ? plugins["Shockwave Flash 2.0"].description : desc;
        if (desc == "") flashVer = -1;
        else{
          var descArr = desc.split(" ");
          var tempArrMajor = descArr[2].split(".");
          var verMajor = tempArrMajor[0];
          var tempArrMinor = (descArr[3] != "") ? descArr[3].split("r") : descArr[4].split("r");
          var verMinor = (tempArrMinor[1] > 0) ? tempArrMinor[1] : 0;
          flashVer =  parseFloat(verMajor + "." + verMinor);
        }
      }
      // WebTV has Flash Player 4 or lower -- too low for video
      else if (userAgent.toLowerCase().indexOf("webtv") != -1) flashVer = 4.0;

      var verArr = reqVerStr.split(",");
      var reqVer = parseFloat(verArr[0] + "." + verArr[2]);
  
      if (flashVer < reqVer){
        if (confirm(msg))
          window.location = "http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash";
      }
    }
  } 
}

addLoadEvent(prepareSlideshow);
addLoadEvent(MM_CheckFlashVersion('8,0,0,0','Content on this page requires a newer version of Adobe Flash Player. Do you want to download it now?'));