// JavaScript Document
var startpos=1050 //
var stoppos=0 // left stop position
var Last=""
var previous="yourID_One"
var sliding=0
var L_Timer=""

function Init(layernum){
if(sliding==1){return} // prevent 2 layers sliding
if(previous==layernum){return} 
else{
slideLeft(layernum)
Sim_Return() // simultaneous slideback
}
}

function slideLeft(layernum){
sliding=1 // running
Last=previous // previous layernum
posnow=parseInt(document.getElementById(layernum).style.left) // current left position
if(posnow<stoppos+30){
posnow-=2;}
else{
if(stoppos<posnow){
posnow-=5;}
}
document.getElementById(layernum).style.left=posnow //new left position

L_Timer=setTimeout("slideLeft('"+layernum+"')",15);

if(posnow<=stoppos){
posnow==stoppos
sliding=0
clearTimeout(L_Timer);
previous=layernum //
}
}

startpos2=startpos
posnow2=stoppos
function Sim_Return(){
sliding=1
if(Last==0){
sliding=0
return}
if(document.getElementById(Last).style.left==startpos){return}
if(posnow2>=startpos2-30){
posnow2+=3}
else{
posnow2+=5;}
document.getElementById(Last).style.left=posnow2 // current right position
R_Timer=setTimeout("Sim_Return('"+Last+"')",15);

if(posnow2>=startpos2){
sliding=0
clearTimeout(R_Timer);
document.getElementById(Last).style.left=startpos2 // prevent overshoot
posnow2=stoppos
}
}