goviasGrid.js

javascript:
if( !window.goviasGrid ){
  window.goviasGrid = document.createElement("div");
  document.getElementsByTagName("body")[0].appendChild(window.goviasGrid);
  window.goviasGrid.style.background = "url(http://tomlea.co.uk/assets/the-grid.png) repeat-y 50% 0";
  window.goviasGrid.style.width = "100%";
  window.goviasGrid.style.height = "100%";
  window.goviasGrid.style.position = "fixed";
  window.goviasGrid.style.top = "0";
  window.goviasGrid.style.bottom = "0";
  window.goviasGrid.style.left = "0";
  window.goviasGrid.style.right = "0";
  window.goviasGrid.style.display = "none";
  window.goviasGrid.style.zIndex = "99999";
  window.goviasGrid.onclick = function(el){ window.goviasGrid.style.display = "none"; };
}

if( window.goviasGrid.style.display == "none"){
  window.goviasGrid.style.display = "block";
}else{
  window.goviasGrid.style.display = "none";
}

undefined;