function SetTab( tab_id, mode ){
	var e = document.getElementById( "menucontent"+tab_id );
	if(e) e.style.display=(mode==true)?"block":"none";
	
	var e = document.getElementById( "menu"+tab_id );
	if(e) e.style.backgroundImage = "url( \'images/menu"+tab_id+((mode==true)?"on":"off")+".gif\' )";
}
function afftab( n ){ SetTab( n, true );}
function hidtab( n ){ SetTab( n, false ); }