[Excavator]

Your background doesn't resize. It moves around when the browser is resized but the image remains 1024x768.

Look at it like this once -

#container {
            background: url(images/background.png);
		        
		        position:relative;
		        z-index:1;
            margin:0 auto; 
		        width:1024px;
		        height:768px;
            }