function Is() {
	var agent = navigator.userAgent.toLowerCase();
	this.major = parseInt(navigator.appVersion);
	this.minor = parseFloat(navigator.appVersion);
	this.ns = ((agent.indexOf('mozilla')!=-1) && ((agent.indexOf('spoofer')==-1) && (agent.indexOf('compatible') == -1)));
	this.ns2 = (this.ns && (this.major == 2));
	this.ns3 = (this.ns && (this.major == 3));
	this.ns4b = (this.ns && (this.minor < 4.04));
	this.ns4 = (this.ns && (this.major >= 4));
	this.ie = (agent.indexOf("msie") != -1);
	this.ie3 = (this.ie && (this.major == 2));
	this.ie4 = (this.ie && (this.major >= 4));
	this.op3 = (agent.indexOf("opera") != -1);
	this.win = (agent.indexOf("win")!=-1);
	this.mac = (agent.indexOf("mac")!=-1);
	this.unix = (agent.indexOf("x11")!=-1);
}
var is = new Is();
function showHideLayers(listeDiv, listeEtat) {
	tabDiv = listeDiv.split("|");
	tabEtat = listeEtat.split("|");
	for (i=0; i<tabDiv.length; i++) {
		if (is.ns4)	{
			layerToSwap = document.getElementById(tabDiv[i]);
		} else {
			layerToSwap = document.all[tabDiv[i]];
		}
		layerToSwap.style.visibility = tabEtat[i];
	}
}