icon_res2 = new Image();
  icon_res2.src = "images/icon_res2.gif";
  
  icon_res = new Image();
  icon_res.src = "images/icon_res.gif";
  
  icon_comm2 = new Image();
  icon_comm2.src = "images/icon_comm2.gif";
  
  icon_comm = new Image();
  icon_comm.src = "images/icon_comm.gif";
  
  icon_hvac2 = new Image();
  icon_hvac2.src = "images/icon_hvac2.gif";
  
  icon_hvac = new Image();
  icon_hvac.src = "images/icon_hvac.gif";
  
  icon_pvf2 = new Image();
  icon_pvf2.src = "images/icon_pvf2.gif";
  
  icon_pvf = new Image();
  icon_pvf.src = "images/icon_pvf.gif";
  
  icon_pool2 = new Image();
  icon_pool2.src = "images/icon_pool2.gif";
  
  icon_pool = new Image();
  icon_pool.src = "images/icon_pool.gif";