function toggleLayer(whichLayer) {
	if (document.getElementById) {
		var style2 = document.getElementById(whichLayer).style;
		style2.display = style2.display? "":"block";
		}
	else if (document.all) {
		var style2 = document.all[whichLayer].style;
		style2.display = style2.display? "":"block";
	}
	else if (document.layers) {
		var style2 = document.layers[whichLayer].style;
		style2.display = style2.display? "":"block";
	}
}

function layerOn(whichLayer) {
	if (document.getElementById) {
		var style2 = document.getElementById(whichLayer).style;
		style2.display = "block";
		}
	else if (document.all) {
		var style2 = document.all[whichLayer].style;
		style2.display = "block";
	}
	else if (document.layers) {
		var style2 = document.layers[whichLayer].style;
		style2.display = "block";
	}
}

function toggleLayerOn(whichLayer) {
	if (document.getElementById) {
		var style2 = document.getElementById(whichLayer).style;
		style2.display = style2.display? "":"none";
		}
	else if (document.all) {
		var style2 = document.all[whichLayer].style;
		style2.display = style2.display? "":"none";
	}
	else if (document.layers) {
		var style2 = document.layers[whichLayer].style;
		style2.display = style2.display? "":"none";
	}
}

function layerOff(whichLayer) {
	if (document.getElementById) {
		var style2 = document.getElementById(whichLayer).style;
		style2.display = "none";
		}
	else if (document.all) {
		var style2 = document.all[whichLayer].style;
		style2.display = "none";
	}
	else if (document.layers) {
		var style2 = document.layers[whichLayer].style;
		style2.display = "none";
	}
}

function switchImage (image_1,image_2,image_id) {
	if (document[image_id].src == image_2) {
		document[image_id].src = image_1;
	} else {
		document[image_id].src = image_2;
	}
}