var orig_x=240
var orig_y=45
var origWidth,origHeight
if(document.layers){
origWidth=window.innerWidth;origHeight=window.innerHeight
window.onresize=function(){if(window.innerWidth !=origWidth || window.innerHeight !=origHeight)history.go(0);}}
var cur_lyr
function swapLayers(id){
if(cur_lyr)hideLayer(cur_lyr)
shiftLayerTo(id,orig_x,orig_y+getScrollY())
showLayer(id)
cur_lyr=id}
function showLayer(id){
var lyr=getElemRefs(id)
if(lyr&&lyr.css)lyr.css.visibility="visible"}
function hideLayer(id){
var lyr=getElemRefs(id)
if(lyr&&lyr.css)lyr.css.visibility="hidden"}
function shiftLayerTo(id,x,y){
var px=document.layers? 0: "px"
var lyr=getElemRefs(id)
if(lyr&&lyr.css){
lyr.css.top=y+px
lyr.css.left=x+px}}
function getElemRefs(id){
var el=(document.getElementById)? document.getElementById(id):(document.all)? document.all[id]:(document.layers)? document.layers[id]: null
if(el)el.css=(el.style)? el.style: el
return el}
function getScrollY(){
var sy=0
if(document.documentElement&&document.documentElement.scrollTop)
sy=document.documentElement.scrollTop
else if(document.body&&document.body.scrollTop)
sy=document.body.scrollTop
else if(window.pageYOffset)
sy=window.pageYOffset
else if(window.scrollY)
sy=window.scrollY
return sy}