function Rollover (img_name, src_off, src_on, hierarchy ) {  if (document.images) {       this.on   = new Image();       this.on.src  = src_on;      this.off  = new Image(); this.off.src = src_off;      this.name = img_name;      this.turn_on   = turn_on;      this.turn_off  = turn_off;      this.status    = "OFF";       this.hierarchy = (hierarchy)?hierarchy:"";   }}function turn_on() {           	         if (NS && this.hierarchy!="")             img_obj = eval(this.hierarchy+".images."+this.name);  else          img_obj = eval("window.document.images."+this.name);	  if (img_obj)  img_obj.src = this.on.src;  }function turn_off() {     if (NS && this.hierarchy!="")      img_obj = eval(this.hierarchy+".images."+this.name);  else         img_obj = eval("window.document.images."+this.name);	  if (img_obj) img_obj.src = this.off.src;  }function Menu() {      this.selected = null;   this.on       = on;    this.off      = off;   this.reset_menu         = reset_menu;    this.sel           = sel;    this.select        = select;   this.selected_item = selected_item;   this.turn_off_current = turn_off_current;}function on(roller) {                     if (this.selected != roller)  roller.turn_on();  }function off(roller){  if (this.selected != roller)  roller.turn_off();}                  function turn_off_current() {  this.selected.turn_off();}function reset_menu() { if (this.selected != null) {	  this.selected.turn_off();  this.selected = null;       } }function sel(roller){  if (this.selected != roller) {     if (this.selected!=null) this.selected.turn_off();     this.selected = roller;  }}function selected_item() {  return this.selected;}function select(item) {  this.selected=item; }