// identifiquation du navigateur
var isIE=(navigator.appName == "Microsoft Internet Explorer");
var isKonqueror=(navigator.appName == "Konqueror");
var isNS6=!isIE && parseInt(navigator.appVersion) >= 5;
var isNS4=!isIE && !isNS6;

function getLayer(id) {
	if (isIE | isNS6 | isKonqueror) {
		return document.getElementById(id);
	} else {
		return document.layers[id];
	}
}

function getLayerStyle(id) {
	if (isIE | isNS6 | isKonqueror) {
		return document.getElementById(id).style;
	} else {
		return document.layers[id];
	}
}

function showLayer(id) {
	getLayerStyle(id).visibility="visible";
}

function hideLayer(id) {
	getLayerStyle(id).visibility="hidden";
}

function writeToLayer(id, content) {
	// ne marche pas sous Opera
	if (isIE | isNS6 | isKonqueror) {
		getLayer(id).innerHTML=content;

	} else {
		var doc=getLayer(id).document;
		doc.write(content);
		doc.close();
	}
}

function moveLayer(id, x, y) {
	style=getLayerStyle(id);
	style.left=x;
	style.top=y;
}