function xs_show_hide(id1,id2,id3){
var res=xs_exp_menu(id1)
if(id2 !='')xs_exp_menu(id2)}
function xs_exp_menu(id){
var itm=null
if(document.getElementById){
itm=document.getElementById(id)}
else if(document.all){
itm=document.all[id]}
else if(document.layers){
itm=document.layers[id]}
if(!itm){}
else if(itm.style){
if(itm.style.display=="none"){
itm.style.display=""
return 1}
else{
itm.style.display="none"
return 2}}
else{
itm.visibility="show"
return 1}}