function SetObjVisibility(id, prop){
	$(id).style.visibility=prop;
}

function Showlayer(id){
	SetObjVisibility(id, "visible");
}

function ShowMentions(){
	SetObjVisibility('Credits', "hidden");
	SetObjVisibility('Mentions', "visible");
}

function ShowCredits(){
	SetObjVisibility('Mentions', "hidden");
	SetObjVisibility('Credits', "visible");
	
}

function Hidelayer(id){
	SetObjVisibility(id, "hidden");
}