var oldclass;

function mshow(mitem){
oldclass = mitem.className;
mitem.setAttribute("class","show "+oldclass);
}

function mhide(mitem){
mitem.setAttribute("class",oldclass);
oldclass='';
}

var soldclass;

function sshow(sitem){
soldclass = sitem.className;
sitem.setAttribute("class","show "+soldclass);
}

function shide(sitem){
sitem.setAttribute("class",soldclass);
soldclass='';
}