function hideBonus() {
	if ( document.layers ) { 
		// navigateur = "Netscape"
		document.layers["DivBonus"].visibility = "hide";
	}else{
		// navigateur = "IE"
		document.all.DivBonus.style.visibility = "hidden";
	}
}

function showBonus() {
	if ( document.layers ) { 
		// navigateur = "Netscape"
		document.layers["DivBonus"].visibility = "show";
	}else{
		// navigateur = "IE"
		document.all.DivBonus.style.visibility = "visible";
	}
}