var gImage = new Object();

function swapInit()
{
   gImage[0] = new Image();
   gImage[0].src = color;
   gImage[1] = new Image();
   gImage[1].src = bw;

}

function swappic()
{
   if (document.getElementById("colorsel").checked)
   {
      // Switch to b&w version
      document.images["showPhoto"].src=gImage[1].src;
   }
   else
   {
      // Switch to color version
      document.images["showPhoto"].src=gImage[0].src;
   }
}