// random gso graphic (for pages without a specific graphic)
//
// dirdepthprefix must be set in main HTML file

var numgsographics = 7;
var gsographics = new Array();

function setgsographics() {  // set up array of gso graphics (called by randomgsographic())
  gsographics[0] = dirdepthprefix + "img/ag/odge.gif";
  gsographics[1] = dirdepthprefix + "img/ar/odge.gif";
  gsographics[2] = dirdepthprefix + "img/fa/odge.gif";
  gsographics[3] = dirdepthprefix + "img/ac/odge.gif";
  gsographics[4] = dirdepthprefix + "img/cb/odge.gif";
  gsographics[5] = dirdepthprefix + "img/fgc/odge.gif";
  gsographics[6] = dirdepthprefix + "img/rp/odge.gif";
  gsographics[7] = dirdepthprefix + "img/odge.gif";
}

function randomgsographic() { // pick one of the gso graphics (called on page load)
  if (document.gso) {
    if (document.gso.src) {
      setgsographics();
      var igsographic = Math.floor(Math.random()*numgsographics);
      document.gso.src = gsographics[igsographic];
    }
  }
}