function roll_init()
{
var_init();
with(navigator) {
  code = appCodeName; 
  app = appName; 
  version = appVersion; 
  iver = parseInt(version); 
  ua = userAgent;
  }
son  = suffixes[0];  
soff = suffixes[1];
uastring = app + " " + iver;
if ( code == "Mozilla" && iver >= 3 )  okay = true;
else okay = false; 
if (rtype == "highlighting") {
  for (var i = 0; i < imagenames.length; i++) {
    var name = imagenames[i];
    var ion  = "r" + name + "on";
    var ioff = "r" + name + "off";
    eval(ion  + " = new Image()");
    eval(ion  + ".src = '" + path + name + son  + ext + "'");
    eval(ioff + " = new Image()");
    eval(ioff + ".src = '" + path + name + soff + ext + "'");
    }
  }
if (rtype == "pointing") {
  blank = new Image();
  on  = new Image();
  on.src  = path + imagenames[0] + ext;
  }
if (rtype == "slideshow") {
  blank = new Image();
  for (var i = 0; i < imagenames.length; i++) {
    var name = imagenames[i];
    eval("r" + name  + " = new Image()");
    eval("r" + name  + ".src = '" + path + name + ext + "'");
    }
  }
}
function over(imgname)
{
if (!okay) return true;
if (rtype == "highlighting")
  eval("document." + imgname + ".src = r" + imgname + "on.src");
if (rtype == "pointing") {
  eval("blank.src = document." + imgname + ".src");
  eval("document." + imgname + ".src = on.src");
  }
if (rtype == "slideshow") {
  blank.src = document.rollover.src;
  eval("document.rollover.src = r" + imgname + ".src");
  }
return true;
}
function out(imgname)
{
if (!okay) return true;
if (rtype == "highlighting")
  eval("document." + imgname + ".src = r" + imgname + "off.src");
if (rtype == "pointing")
  eval("document." + imgname + ".src = blank.src");
if (rtype == "slideshow") {
  document.rollover.src = blank.src;
  }
return true;
}