HTML5 Canvas - How to fill() a specific context
===

I'm trying to make a website where an image is drawn on Canvas, then later the user is able to press a button to ctx.fill() certain parts of it with color. I'm running into issues where I can only ctx.fill() the most recently created shape which often isn't the shape I want.

Here's an example. In this code (live at http://build.rivingtondesignhouse.com/piol/test/) I'm trying to draw the first rectangle, then save() it on the stack, then draw the second rectangle (and don't save it), then when my fill() function is called I want to restore() the first rectangle and ctx.fill() it with a different pattern. It doesn't work!

In practice, I'm actually trying to fill the gray part of this complex shape with any color the user chooses AFTER the image has been drawn, but I think the technique is the same. (http://build.rivingtondesignhouse.com/piol/test/justTop.html)

Thanks in advance for any help!!!

Here's the code:

    <script type="text/javascript">
	var canvas;
	var ctx;
	
	function init() {
		canvas = document.getElementById("canvas");
		ctx = canvas.getContext("2d");
		draw();
	}

	
	function draw() {	
		ctx.fillStyle = '#FA6900';
		ctx.shadowOffsetX = 5;
		ctx.shadowOffsetY = 5;
		ctx.shadowBlur    = 4;
		ctx.shadowColor   = 'rgba(204, 204, 204, 0.5)';
		ctx.fillRect(0,0,15,150);
		ctx.save();
		
		ctx.fillStyle = '#E0E4CD';
		ctx.shadowOffsetX = 10;
		ctx.shadowOffsetY = 10;
		ctx.shadowBlur    = 4;
		ctx.shadowColor   = 'rgba(204, 204, 204, 0.5)';
		ctx.fillRect(30,0,30,150);
	}
	
	function fill(){
		var image = new Image();
		image.src = "http://www.html5canvastutorials.com/demos/assets/wood-pattern.png";
		image.onload = drawPattern;
		function drawPattern() {
			ctx.restore();
			ctx.fillStyle = ctx.createPattern(image, "repeat");
			ctx.fill();
		}
	}

	init();
</script>