diff --git a/js/earth.png b/js/earth.png
new file mode 100644
index 0000000..c20f0cd
Binary files /dev/null and b/js/earth.png differ
diff --git a/js/empty.png b/js/empty.png
new file mode 100644
index 0000000..04206c6
Binary files /dev/null and b/js/empty.png differ
diff --git a/js/gui.js b/js/gui.js
index fe59612..5573ff8 100644
--- a/js/gui.js
+++ b/js/gui.js
@@ -1,28 +1,31 @@
 var mineGui_mine, mineGui_curmap, mineGui_curndx, mineGui_moves = "";
 var mineGui_movesBackup = [];
 var mineGui_customNdx = 1;
+var mineGui_canvas = true;
 
-function mineGui_addCustomMap() {
-	var map = document.getElementById("mineGui_data").value;
-	var mine;
-	var selMap = document.getElementById("mineGui_selectMap");
-	document.getElementById("mineGui_addDataResult").textContent = "";
-	try {
-		mine = new Mine(map);
-	} catch (e) {
-		document.getElementById("mineGui_addDataResult").textContent = "Adding map failed: " + e;
-		return;
-	}
-	mineMaps["custom" + mineGui_customNdx] = map;
-	var entry = document.createElement("option");
-	entry.textContent = "custom" + mineGui_customNdx;
-	selMap.appendChild(entry);
-	mineGui_customNdx++;
+var mineGui_imgSources = {
+	'R': 'robot.png',
+	'#': 'wall.png',
+	'*': 'rock.png',
+	'\\': 'lambda.png',
+	'L': 'liftclosed.png',
+	'O': 'liftopen.png',
+	'.': 'earth.png',
+	' ': 'empty.png'
+};
+var mineGui_images = {};
+var mineGui_imagesNeed = 0;
 
-	window.setTimeout(function() {
-		selMap.selectedIndex = selMap.options.length - 1;
-		selMap.onchange();
-	}, 0);
+function mineGui_loadImg(key, src) {
+	var img;
+	++mineGui_imagesNeed;
+	mineGui_images[key] = img = new Image();
+	img.onload = function() {
+		if (0 == --mineGui_imagesNeed) {
+			mineGui_show();
+		}
+	};
+	img.src = src;
 }
 
 function mineGui_start() {
@@ -31,6 +34,7 @@ function mineGui_start() {
 	var inpMoves = document.getElementById("mineGui_moves");
 	var customMapInput = document.getElementById("mineGui_data")
 	var validMoves = {L:1,U:1,R:1,D:1,A:1,W:1};
+	var k;
 	document.getElementById("mineGui_addData").onclick = mineGui_addCustomMap;
 	selMap.onchange = function() {
 		var k = selMap.options[selMap.selectedIndex].text;
@@ -54,21 +58,30 @@ function mineGui_start() {
 	inpMoves.onpaste = delayInpValidate;
 	inpMoves.onkeypress = delayInpValidate;
 	document.body.onkeydown = function (event) {
-// 		console.log("body", event, event.type);
+// 		console.log("body", event);
+// 		console.log("isChar", event.isChar,
+// 					"; char '"+String.fromCharCode(event.charCode)+
+// 					"'; key '"+String.fromCharCode(event.keyCode)+"'")
 		if (document.activeElement === customMapInput) return;
 		if (event.ctrlKey || event.altKey || event.metaKey) return;
 		var handled = true;
-		var cmd = String.fromCharCode(event.charCode || event.keyCode).toUpperCase();
+		
+		// ascii keys are reported as uppercase ascii code
+		var cmd = String.fromCharCode(event.keyCode);
 		if (validMoves[cmd]) {
 			mineGui_move(cmd);
 		} else if (cmd == 'C') { // clear
 			mineGui_moves = "";
 			mineGui_updateMine();
-		} else if (event.keyCode == 8 || event.charCode == 8) {
-			// backspace -> undo
+		} else if (cmd == 'T') { // toggle text/canvas
+			mineGui_canvas = !mineGui_canvas;
+			console.log("canvas show", mineGui_canvas);
+			mineGui_show();
+		} else switch (event.keyCode) {
+		case 8: // backspace -> undo
 			mineGui_moves = mineGui_moves.slice(0,-1);
 			mineGui_updateMine();
-		} else switch (event.keyCode) {
+			break;
 		case 33: // page up
 			if (selMap.selectedIndex > 0) {
 				selMap.selectedIndex--;
@@ -82,16 +95,16 @@ function mineGui_start() {
 			}
 			break;
 		case 37: // left
-			mineGui_move('L');
+			if (mineGui_mine.validMove('L')) mineGui_move('L');
 			break;
 		case 38: // up
-			mineGui_move('U');
+			if (mineGui_mine.validMove('U')) mineGui_move('U');
 			break;
 		case 39: // right
-			mineGui_move('R');
+			if (mineGui_mine.validMove('R')) mineGui_move('R');
 			break;
 		case 40: // down
-			mineGui_move('D');
+			if (mineGui_mine.validMove('D')) mineGui_move('D');
 			break;
 		default:
 			handled = false;
@@ -103,6 +116,11 @@ function mineGui_start() {
 			return true;
 		}
 	};
+	for (k in mineGui_imgSources) {
+		if (mineGui_imgSources.hasOwnProperty(k)) {
+			mineGui_loadImg(k, mineGui_imgSources[k]);
+		}
+	}
 	for (k in mineMaps) {
 		if (mineMaps.hasOwnProperty(k)) {
 			var entry = document.createElement("option");
@@ -115,6 +133,29 @@ function mineGui_start() {
 	selMap.onchange();
 }
 
+function mineGui_addCustomMap() {
+	var map = document.getElementById("mineGui_data").value;
+	var mine;
+	var selMap = document.getElementById("mineGui_selectMap");
+	document.getElementById("mineGui_addDataResult").textContent = "";
+	try {
+		mine = new Mine(map);
+	} catch (e) {
+		document.getElementById("mineGui_addDataResult").textContent = "Adding map failed: " + e;
+		return;
+	}
+	mineMaps["custom" + mineGui_customNdx] = map;
+	var entry = document.createElement("option");
+	entry.textContent = "custom" + mineGui_customNdx;
+	selMap.appendChild(entry);
+	mineGui_customNdx++;
+
+	window.setTimeout(function() {
+		selMap.selectedIndex = selMap.options.length - 1;
+		selMap.onchange();
+	}, 0);
+}
+
 function mineGui_move(cmd) {
 	for (i = 0; i < cmd.length; ++i) {
 		if (mineGui_mine.state != Mine.ALIVE) break;
@@ -149,12 +190,42 @@ function mineGui_updateMine() {
 function mineGui_show() {
 	var waterLevel = Math.max(mineGui_mine.meta.Water, 0);
 	var map = mineGui_mine.toString().split(/\n/);
+	var canv = document.getElementById("mineGui_mineCanvas");
+	var mapNode = document.getElementById("mineGui_mineMap");
+	if (mineGui_canvas && 0 == mineGui_imagesNeed) {
+		canv.style.display = '';
+		canv.style.visibility = 'visible';
+		mapNode.style.display = 'none';
+		mapNode.style.visibility = 'hidden';
+		canv.width = 16*mineGui_mine.width;
+		canv.height = 16*mineGui_mine.height;
+		var ctx = canv.getContext("2d");
+		ctx.globalAlpha=1.0;
+		ctx.fillStyle = "black";
+		ctx.fillRect(0,0,canv.width, canv.height);
+		for (var y = 0; y < mineGui_mine.height; ++y) {
+			for (var x = 0; x < mineGui_mine.width; ++x) {
+				ctx.drawImage(mineGui_images[map[y][x]],16*x,16*y);
+			}
+		}
+		ctx.fillStyle = "#0000FF";
+		ctx.globalAlpha = 0.3;
+		y = 16*(mineGui_mine.height - waterLevel);
+		ctx.fillRect(0,y,canv.width, canv.height-y);
+	} else {
+		canv.style.display = 'none';
+		canv.style.visibility = 'hidden';
+		mapNode.style.display = '';
+		mapNode.style.visibility = 'visible';
+	}
+	
 	if (waterLevel > 0) {
 		document.getElementById("mineGui_mineMapWater").textContent = map.splice(-waterLevel).join("\n");
 	} else {
 		document.getElementById("mineGui_mineMapWater").textContent = "";
 	}
-	document.getElementById("mineGui_mineMap").textContent = map.join("\n");
+	document.getElementById("mineGui_mineMapDry").textContent = map.join("\n");
+	
 	document.getElementById("mineGui_moves").value = mineGui_moves;
 	var state = "";
 	switch (mineGui_mine.state) {
diff --git a/js/index.html b/js/index.html
index 3336f5b..e350630 100644
--- a/js/index.html
+++ b/js/index.html
@@ -7,6 +7,7 @@
 	<h2>ICFP Contest 2012 Simulator</h2>
 	Links: <a href="http://icfpcontest2012.wordpress.com/">contest page</a>.<br>
 	<i>This simulator may or may not perform according to specs, who knows...</i><br/>
+	<noscript><h3 style="color:red">This page needs javascript</h3></noscript>
 	
 	<br/>
 	
@@ -14,9 +15,9 @@
 		Select Map: <select id="mineGui_selectMap"></select>
 		<div style="white-space: pre">Moves: <input type="text" id="mineGui_moves" value="" style="width: 80%; font-weight: bold; border: 1px solid"></input></div>
 		<table align=top><tr><td style="padding-right: 50px;vertical-align:top">
-			<pre><span id="mineGui_mineMap" style="margin-bottom: 0px"></span>
+			<pre id="mineGui_mineMap"><span id="mineGui_mineMapDry" style="margin-bottom: 0px"></span>
 <span id="mineGui_mineMapWater" style="margin-top: 0px; background: lightblue"></span>
-			</pre>
+			</pre><canvas id="mineGui_mineCanvas" width="0" height="0"></canvas>
 		</td><td style="vertical-align:top">
 			<pre id="mineGui_meta"></pre>
 		</td></tr></table>
@@ -34,7 +35,7 @@
 	
 	<pre>Help:
 (<b>L</b>)eft/(<b>U</b>)p/(<b>R</b>)ight/(<b>D</b>)own work as expected (letter and arrow keys), (<b>A</b>)bort and (<b>W</b>)ait too.
-Special keys: PageUp/PageDown for map select, Backspace for undo and (<b>C</b>)lear
+Special keys: PageUp/PageDown for map select, Backspace for undo, (<b>C</b>)lear and (<b>T</b>)oggle text mode
 Be careful: a reload looses all custom maps and saved moves.
 Listed highscore can be outdated.
 	</pre>
diff --git a/js/lambda.png b/js/lambda.png
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index 0000000..29a2e08
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diff --git a/js/liftclosed.png b/js/liftclosed.png
new file mode 100644
index 0000000..551ee71
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diff --git a/js/liftopen.png b/js/liftopen.png
new file mode 100644
index 0000000..e8cba11
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diff --git a/js/robot.png b/js/robot.png
new file mode 100644
index 0000000..0961056
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diff --git a/js/rock.png b/js/rock.png
new file mode 100644
index 0000000..c807636
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diff --git a/js/wall.png b/js/wall.png
new file mode 100644
index 0000000..96cb7c4
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