var Button_default = new Image();
Button_default.src = "images/button.gif";
var Button_pressed = new Image();
Button_pressed.src = "images/button2.gif"
var LogoBack = new Image();
LogoBack.src = "images/logoback.gif";
var TopImg = new Image();
TopImg.src = "images/logo.gif";
var SideImg = new Image();
SideImg.src = "images/dollarsback.gif";
var GlobeImg = new Image();
GlobeImg.src = "images/globe.gif";

var numButtons = 10;
var target = new Image();
var buttonName = "button";
var LCV = 1;

var numSubMenus = 3;
var subMenu = new Array();
subMenu[1] = "about_menu";
subMenu[2] = "services_menu";
subMenu[3] = "paybill_menu";

function showSubmenu(menuname) {
  if(document.layers) // Netscape 4 
  {      
     document.menuname.visibilty="visible";    
  }
  if(document.all) // Internet Explorer 
  {     
     document.all[menuname].style.visibility="visible"; //
  }
  if(!document.all && document.getElementById) // Netscape 5+
  {     
     document.getElementById(menuname).style.visibility="visible";
  }
}

function deactivateMenus() {
 for (LCV=1; LCV <= numSubMenus; LCV++)
 {
  if(document.all) // Internet Explorer 
  {     
     document.all[subMenu[LCV]].style.visibility="hidden"; 
  }
  if(!document.all && document.getElementById) // Netscape 5+
  {     
     document.getElementById(subMenu[LCV]).style.visibility="hidden";
  }
 }
}

function changeMenu(buttonNum, menuNum) {
  deactivateMenus();
      buttonName = "button";
      buttonName = buttonName + buttonNum;
      target = document.getElementById(buttonName);
      target.src = Button_pressed.src;
      if (menuNum > 0 ) {
        showSubmenu(subMenu[menuNum]);
      }

}

function changeDefault() {
    for (LCV = 1; LCV <= numButtons; LCV++)
    {
      target = document.getElementById("button" + LCV);
      target.src = Button_default.src;
    }
}