var	dynmenu=new Array(false, false, false, false, false),
		timerID=new Array(5);

function showMenu(idx) {
var i;
for(i=0;i<5;i++) if (dynmenu[i] && (i!=idx)) hideMenu(i);
if(document.getElementById) document.getElementById("dynmenu"+idx).style.visibility='visible';
else if (document.all) eval("document.all.dynmenu"+idx+".style.visibility='visible';");
else if (document.layers) eval("document.dynmenu"+idx+".visibility='visible';");
dynmenu[idx]=true;
timerID[idx]=setTimeout("hideMenu("+idx+")",25000);
return;
}

function hideMenu(idx) {
clearTimeout(timerID[idx]);
if(document.getElementById) document.getElementById("dynmenu"+idx).style.visibility='hidden';
else if (document.all) eval("document.all.dynmenu"+idx+".style.visibility='hidden';");
else if (document.layers) eval("document.dynmenu"+idx+".visibility='hidden';");
dynmenu[idx]=false;
return;
}