function HideShow(menu){

document.getElementById('Mbigcats').style.display="none";
document.getElementById('Mproblems').style.display="none";
document.getElementById('Mfiles').style.display="none";
document.getElementById('Mawards').style.display="none";
document.getElementById('Mlinks').style.display="none";
document.getElementById('Mnews').style.display="none";
document.getElementById('Mupdates').style.display="none";
document.getElementById('Mgallery').style.display="none";
document.getElementById('Madd').style.display="none";

document.getElementById(menu).style.display="";
}