fishtank01 = new Image(500,135);
fishtank01.src = '/greg/x10/fishtank-day.gif';
fishtank02 = new Image(500,135);
fishtank02.src = '/greg/x10/fishtank-week.gif';

function showimg(id) {
 document.images['FISHTANK'].src=eval(id+".src");
}

// Detect browser version and features
var isNS = (navigator.appName == "Netscape");
// alert("isNS? " + isNS);


//
// InsertLink
//
function InsertLink() {
	if (isNS) {
		layerstate='hide';
		InsertLinkNS();
	} else {
		layerstate='hidden';
		InsertLinkIE();
	}
}


function InsertLinkNS() {
	document.writeln('(Chart <A HREF="Javascript:TurnOnOffNS(document.FT)"> on/off</A>)');
}

// Make layer hidden/visible
function TurnOnOffNS(layername) {
	if (layerstate == 'hide') {
		layerstate = 'show';
	} else {
		layerstate = 'hide';
	}
	
	layername.visibility = layerstate;
}


//
// Internet Exploder version
// This browser is a useless piece of crap so don't do anything.
//
function InsertLinkIE() {
	// alert("IE Hello?");
	// alert("Layers: " + document.layers["FT"]);
	// document.writeln('(Chart <A HREF="Javascript:TurnOnOffIE(document.layers["FT"])"> on/off</A>)');
}

//
//
// Make layer hidden/visible
function TurnOnOffIE(layername) {
	if (layerstate == 'hidden') {
		layerstate = 'visible';
	} else {
		layerstate = 'hidden';
	}
	alert("IE Hello? " + layername.style.visibility);
	layername.style.visibility = layerstate;

}