//Navigationsscripts			
function rollover(which){
	document.getElementById(which).style.visibility = "visible";
}

function rollout(which){
	document.getElementById(which).style.visibility = "hidden";
}


function rollover_link(which, weissesViereck){
	document.getElementById(which).className="nav_link1";
	document.getElementById(weissesViereck).className="visib";
}

function rollout_link(which, weissesViereck){
	document.getElementById(which).className="nav_link";
	document.getElementById(weissesViereck).className="navbor";
}