icona = new Image()   
icona.src = "images/icon1on.gif"  

iconb = new Image()
iconb.src = "images/icon1.gif"

iconc = new Image()   
iconc.src = "images/icon2on.gif"  

icond = new Image()
icond.src = "images/icon2.gif"

icone = new Image()   
icone.src = "images/icon3on.gif"  

iconf = new Image()
iconf.src = "images/icon3.gif"

icong = new Image()   
icong.src = "images/icon4on.gif"  

iconh = new Image()
iconh.src = "images/icon4.gif"

iconi = new Image()   
iconi.src = "images/icon5on.gif"  

iconj = new Image()
iconj.src = "images/icon5.gif"

iconk = new Image()   
iconk.src = "images/icon6on.gif"  

iconl = new Image()
iconl.src = "images/icon6.gif"

iconm = new Image()   
iconm.src = "images/icon7on.gif"  

iconn = new Image()
iconn.src = "images/icon7.gif"

icono = new Image()   
icono.src = "images/icon8on.gif"  

iconp = new Image()
iconp.src = "images/icon8.gif"

iconq = new Image()   
iconq.src = "images/icon9on.gif"  

iconr = new Image()
iconr.src = "images/icon9.gif"

icons = new Image()   
icons.src = "images/icon10on.gif"  

icont = new Image()
icont.src = "images/icon10.gif"

iconu = new Image()   
iconu.src = "images/icon11on.gif"  

iconv = new Image()
iconv.src = "images/icon11.gif"

iconw = new Image()   
iconw.src = "images/icon12on.gif"  

iconx = new Image()
iconx.src = "images/icon12.gif"

icony = new Image()   
icony.src = "images/icon13on.gif"  

iconz = new Image()
iconz.src = "images/icon13.gif"

iconaa = new Image()   
iconaa.src = "images/icon14on.gif"  

iconbb = new Image()
iconbb.src = "images/icon14.gif"

iconcc = new Image()   
iconcc.src = "images/icon15on.gif"  

icondd = new Image()
icondd.src = "images/icon15.gif"

iconee = new Image()   
iconee.src = "images/icon16on.gif"  

iconff = new Image()
iconff.src = "images/icon16.gif"

iconz = new Image()   
iconz.src = "images/icon17on.gif"  

iconzz = new Image()
iconzz.src = "images/icon17.gif"

function imageChange(imgName,imgSrc){
document.images[imgName].src = eval(imgSrc +".src")
}