function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

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("nav")) return false;
  var nav = document.getElementById("nav");
  var slider = document.getElementById("slider");

  var links = nav.getElementsByTagName("a");
  for (var i=0; i<links.length; i++) {
    links[i].onmouseover = function() {
      var destination = this.getAttribute("href");
      if (destination.indexOf("/index.php") != -1) {
        moveElement("slider",0,0,50);
      }
	  if (destination.indexOf("/about-us/") != -1) {
        moveElement("slider",-940,0,50);
      }
	  if (destination.indexOf("/staff-bios/") != -1) {
        moveElement("slider",-940,0,0);
      }
	  if (destination.indexOf("/news/") != -1) {
        moveElement("slider",-940,0,0);
      }
      if (destination.indexOf("/case-studies/") != -1) {
        moveElement("slider",-1880,0,50);
      }
      if (destination.indexOf("/creative/") != -1) {
        moveElement("slider",-2820,0,50);
      }
      if (destination.indexOf("/strategy/") != -1) {
        moveElement("slider",-3760,0,50);
      }
      if (destination.indexOf("/social-media-pr/") != -1) {
        moveElement("slider",-4700,0,50);
      }
	  if (destination.indexOf("/media/") != -1) {
        moveElement("slider",-5640,0,50);
      }
	  if (destination.indexOf("/contact-us/") != -1) {
        moveElement("slider",-6580,0,50);
      }
	  
    }
  }
}

addLoadEvent(prepareSlideshow);