var img01 = new Image();
img01.src = "images/start-testing.gif";

var img11 = new Image();
img11.src = "images/start-testing_hover.gif"

var img02 = new Image();
img02.src = "images/change.gif";

var img22 = new Image();
img22.src = "images/change_hover.gif"

var flash_on = new Image();
flash_on.src = "/images/flash_on.gif";

var flash_off = new Image();
flash_off.src = "/images/flash_off.gif";

function swapImages(param) {
	
	switch(param) {
		case 0:
			document.images["img"].src = img01.src; break;
		case 1:
			document.images["img"].src = img11.src; break;
		case 2:
			document.images["img"].src = img02.src; break;
		case 3:
			document.images["img"].src = img22.src; break;
		case 4:
			document.images["flash"].src = flash_on.src; break;
		case 5:
			document.images["flash"].src = flash_off.src; break;
	}
};