function OpenMenu(id,prfx) {
if (id.className == prfx+"open") 
id.className=prfx+"close";
else  id.className=prfx+"open";
}

dom = (document.getElementById)? true : false;
nn4 = (document.layers)? true : false;
ie4 = (document.all && !dom)? true : false;
function Open2(what){
if (ie4)
{
if (document.all[what].style.visibility=="visible") document.all[what].style.visibility="hidden"
else document.all[what].style.visibility="visible";
} else
if (nn4)
{ if  (document.layers[what].visibility == "show")  document.layers[what].visibility = "hide"
else   document.layers[what].visibility = "show";
}
else
{
if (what.style.visibility=="visible") what.style.visibility="hidden"
else what.style.visibility="visible";

}
exit=false;
}

function Open(what){
if (ie4)
{
if (document.all[what].style.visibility=="visible") document.all[what].style.visibility="hidden"
else document.all[what].style.visibility="visible";
} else
if (nn4)
{ if  (document.layers[what].visibility == "show")  document.layers[what].visibility = "hide"
else   document.layers[what].visibility = "show";
}
else
{
if (what.style.visibility=="visible") what.style.visibility="hidden"
else what.style.visibility="visible";

}
exit=false;
}