if (document.images) {

	nav_homeon = new Image();
    nav_homeon.src = "/images/nav_home_on.gif";
    nav_homeoff = new Image();
    nav_homeoff.src = "/images/nav_home_off.gif";
	nav_abouton = new Image();
    nav_abouton.src = "/images/nav_about_on.gif";
    nav_aboutoff = new Image();
    nav_aboutoff.src = "/images/nav_about_off.gif";
	nav_taichion = new Image();
    nav_taichion.src = "/images/nav_taichi_on.gif";
    nav_taichioff = new Image();
  	nav_taichioff.src = "/images/nav_taichi_off.gif";
	nav_wushuon = new Image();
    nav_wushuon.src = "/images/nav_wushu_on.gif";
    nav_wushuoff = new Image();
    nav_wushuoff.src = "/images/nav_wushu_off.gif";
	nav_qigongon = new Image();
    nav_qigongon.src = "/images/nav_qigong_on.gif";
    nav_qigongoff = new Image();
    nav_qigongoff.src = "/images/nav_qigong_off.gif";
 	nav_tcmon = new Image();
    nav_tcmon.src = "/images/nav_tcm_on.gif";
    nav_tcmoff = new Image();
    nav_tcmoff.src = "/images/nav_tcm_off.gif";
	nav_supplieson = new Image();
    nav_supplieson.src = "/images/nav_supplies_on.gif";
    nav_suppliesoff = new Image();
    nav_suppliesoff.src = "/images/nav_supplies_off.gif";
 	nav_locationon = new Image();
    nav_locationon.src = "/images/nav_location_on.gif";
    nav_locationoff = new Image();
    nav_locationoff.src = "/images/nav_location_off.gif";
	nav_linkson = new Image();
    nav_linkson.src = "/images/nav_links_on.gif";
    nav_linksoff = new Image();
    nav_linksoff.src = "/images/nav_links_off.gif";
  nav_classeson = new Image();
    nav_classeson.src = "/images/nav_classes_on.gif";
    nav_classesoff = new Image();
    nav_classesoff.src = "/images/nav_classes_off.gif";
	
      
}

// Function to 'activate' images.
function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
           
           
        }
}



// Function to 'deactivate' images.
function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
            
          
        }
}

// Copyright 1999 - 2002 by Ray Stott, Pop-up Windows Script ver 2.0
// OK to use if this copyright is included
// Script is available at http://www.crays.com/jsc          

var popWin = null    // use this when referring to pop-up window
var winCount = 0
var winName = "popWin"
function openPopWin(winURL, winWidth, winHeight, winFeatures, winLeft, winTop){
  var d_winLeft = 20  // default, pixels from screen left to window left
  var d_winTop = 20   // default, pixels from screen top to window top
  winName = "popWin" + winCount++ //unique name for each pop-up window
  closePopWin()           // close any previously opened pop-up window
  if (openPopWin.arguments.length >= 4)  // any additional features? 
    winFeatures = "," + winFeatures
  else 
    winFeatures = "" 
  if (openPopWin.arguments.length == 6)  // location specified
    winFeatures += getLocation(winWidth, winHeight, winLeft, winTop)
  else
    winFeatures += getLocation(winWidth, winHeight, d_winLeft, d_winTop)
  popWin = window.open(winURL, winName, "width=" + winWidth 
           + ",height=" + winHeight + winFeatures)
  }
function closePopWin(){    // close pop-up window if it is open 
  if (navigator.appName != "Microsoft Internet Explorer" 
      || parseInt(navigator.appVersion) >=4) //do not close if early IE
    if(popWin != null) if(!popWin.closed) popWin.close() 
  }
function getLocation(winWidth, winHeight, winLeft, winTop){
  return ""
  }
	
	
function getLocation(winWidth, winHeight, winLeft, winTop){
  var winLocation = ""
  if (winLeft < 0)
    winLeft = screen.width - winWidth + winLeft
  if (winTop < 0)
    winTop = screen.height - winHeight + winTop
  if (winTop == "cen")
    winTop = (screen.height - winHeight)/2 - 20
  if (winLeft == "cen")
    winLeft = (screen.width - winWidth)/2
  if (winLeft>0 & winTop>0)
    winLocation =  ",screenX=" + winLeft + ",left=" + winLeft	
                + ",screenY=" + winTop + ",top=" + winTop
  else
    winLocation = ""
  return winLocation
  }