function PreloadImages(rp){
  Loaded = 0;
  // array a: page designation codes, i & j are simple ForEach counters, variable ext the image extension
  var d=document, a=new Array("abt","ref","srv"), i, j, ext=".jpg"
  // array b: image name endings, pth is the path from root to images
  var b=new Array("","-o","-d"), pth="./images/pag/nav"
  if(!d.Vx) d.Vx=new Array();
  for(i=0;i<a.length;i++){ for(j=0;j<b.length;j++){
      d.Vx[a[i]+b[j]]=new Image; d.Vx[a[i]+b[j]].src=pth+a[i]+b[j]+ext; }
  }
  Loaded = 1;
}
function ImgOvr(Ax){
  if (Loaded) { var d=document; d.images[Ax].src=d.Vx[Ax+"-o"].src}}
function ImgOut(Ax){
  if (Loaded) { var d=document; d.images[Ax].src=d.Vx[Ax+""].src}}
function ImgDwn(Ax){
  if (Loaded) { var d=document; d.images[Ax].src=d.Vx[Ax+"-d"].src}}
function getSelected(obj) {
  obj.action += window.location.search;  obj.submit(); }