// JavaScript Document
function randomiseImage()
{
	var headerImages = new Array ('Images/Header/plane.jpg','Images/Header/truck.jpg','Images/Header/vessel.jpg','Images/Header/forklift.jpg','Images/Header/racking.jpg');
	var headerAlts = new Array ('Freight Plane','Container Truck','Container Vessel','Forklift in Warehouse','Warehouse Racking');
	var randomNumber = Math.floor(Math.random() * headerImages.length);
	var el = document.getElementById('randomImageContainer');
	while (el.firstChild) { el.removeChild(el.firstChild); }
	var t = document.createElement('IMG');
	t.setAttribute('src',headerImages[randomNumber]);
	t.setAttribute('alt',headerAlts[randomNumber]);
	el.appendChild(t);
}

/*
	This function was stolen from:
	http://simon.incutio.com/archive/2004/05/26/addLoadEvent
*/
function addLoadEvent(func)
{
  var oldonload = window.onload;
  if (typeof window.onload != 'function')
  {
    window.onload = func;
  } 
  else 
  {
    window.onload = function() {if (oldonload) {oldonload();} func(); }
  }
}

addLoadEvent(randomiseImage);