function addEngine(name,ext,cat)
{
  if ((typeof window.sidebar == "object") && (typeof
  window.sidebar.addSearchEngine == "function"))
  {
    //cat="Web";
    //cat=prompt("In what category should this engine be installed?","Web")
    window.sidebar.addSearchEngine(
      "http://r09.org/sh/engine/"+name+".src",
      "http://r09.org/sh/engine/"+name+"."+ext,
      name,
      cat );
  }
  else
  {
    errorMsg(name,ext,cat);
  }
}