function showsubmenu(sid)
{
for (i=1;i<n;i++){
if(i==sid){
if(document.all("submenu"+sid).style.display=='none')
{document.all("submenu"+sid).style.display='block';}
else{document.all("submenu"+sid).style.display='none';}
}
else
{
document.all(String("submenu"+i)).style.display='none';
}
}
}
showsubmenu(n)
{
for (i=1;i<n;i++){
if(i==sid){
if(document.all("submenu"+sid).style.display=='none')
{document.all("submenu"+sid).style.display='block';}
else{document.all("submenu"+sid).style.display='none';}
}
else
{
document.all(String("submenu"+i)).style.display='none';
}
}
}
showsubmenu(n)
http://yinzhihua2008.blog.163.com/blog/static/7943067200611308207229/