var preloadedImage1 = new Image();
var preloadedImage2 = new Image();

preloadedImage1.src="/support/health-safety/images/HandS-red.gif";
preloadedImage2.src="/support/health-safety/images/HandS-yellow.gif";

function switchImages(_onOff) 
	{
		if (_onOff=="on")
			document.imagename.src=preloadedImage1.src;  
		else
			document.imagename.src=preloadedImage2.src;  
	}