function showHide(id, toggle){
	eval("document.getElementById(id).style.visibility = \"" + toggle + "\"");
}

function MainMenuOn(){
	showHide('mainmenu','visible')
	}
function MainMenuOff(){
	showHide('mainmenu','hidden')
	}
function InfoMenuOn(){
	showHide('infomenu','visible')
	}
function InfoMenuOff(){
	showHide('infomenu','hidden')
	}