var lastEl;
function showsubmenu(sid){
    whichEl = document.getElementById("submenu" + sid);
    if (whichEl.style.display == "none"){
        whichEl.style.display='';
        try{if(lastEl!=whichEl)lastEl.style.display="none";}catch(e){}
        lastEl=whichEl;
    }
    else{
        whichEl.style.display='none';
    }
}