addLoadEvent(showNav);
function addLoadEvent(func){
  var oldonload = window.onload;
  if (typeof window.onload != 'function'){
    window.onload = func;
  }else{
    window.onload = function(){
      oldonload();
      func();
    }
  }
}
function moveElement(elementID,initial_x,initial_y,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 = initial_x+"px";
  }
  if (!elem.style.bottom){
    elem.style.bottom = initial_y+"px";
  }
  var xpos = parseInt(elem.style.left);
  var ypos = parseInt(elem.style.bottom);
  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.bottom = ypos + "px";
  var repeat = "moveElement('"+elementID+"',"+initial_x+","+initial_y+","+final_x+","+final_y+","+interval+")";
  elem.movement = setTimeout(repeat,interval);
}
function showNav(){
  var content = document.getElementById("content");
  content.onmouseover = function(){
    moveElement("content",0,-90,0,0,5);
  }
  content.onmouseout = function(){
    moveElement("content",0,0,0,-90,5);
  }
}