var jscript;

  if ( (navigator.userAgent.indexOf("a/3",6) == -1) &&
       (navigator.userAgent.indexOf("a/4",6) == -1) ) {
    jscript = 0;
  }
  else {
    jscript = 1;
  }

  if ( jscript ) {

    syogen_on             = new Image();
    syogen_on.src         = "IMAGES/bu_syogen_on.gif";
    syogen_off            = new Image();
    syogen_off.src        = "IMAGES/bu_syogen_off.gif";
    
  }

function imgRoll3(imgDocID, mouseMov) {
    if ( jscript ) {
      if ( mouseMov == "in" ) {
         document.images[imgDocID].src = eval(imgDocID + "_on.src");
      }
      if ( mouseMov == "out" ) {
         document.images[imgDocID].src = eval(imgDocID + "_off.src");
      }
}
}