function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
function buttonOn() {
  aa = buttonOn.arguments[0];
  if (document.images && (preloadFlag == true) && !(aa == currentInd)) {
    document[aa].src="images/mn_on.gif";
  }
}
function buttonOff() {
  if (document.images && (preloadFlag == true) && !(aa == currentInd)) {
    document[buttonOff.arguments[0]].src="images/mn_off.gif";
  }
}
var preloadFlag = false;
var currentInd = "Ind_01";
function preloadImages( current ) {
  if (document.images) {
    ind_on = newImage("images/mn_off.gif");
    ind_cur = newImage("images/mn_cur.gif");
    preloadFlag = true;
    currentInd = current;
    document[currentInd].src="images/mn_cur.gif";
  }
}