Toggle Image JavaScript

Here is a quick JavaScript that I had to put together. It toggles between two images when clicked.

One of the odd isuues that I ran into was the image path for comparision. Firefox returns the full path — including “http://”, etc. IE returned what I would expect, which is the path that I assigned. To get around this issue, I had to add extra logic to locate “.com” and remove any domain information.

<script type = 'text/javascript'>
function toggleImage() {
	// Toggle Script - Version 1.0 - April 11, 2007.
	// Retrieve banner and SRC attribute.
	var toggleBanner = document.getElementById('sourceBanner');
	var currentImage = toggleBanner.getAttribute('src');

	// Retrieve path after domain for comparison.
	if (currentImage.indexOf('.com') != -1) {
		currentImage = currentImage.split('.com')[1];
	}

	// Set image values.
	var firstImage = '/images/banner_01.jpg';
	var firstAlt = 'Alt Text 01';
	var secondImage = '/images/banner_02.jpg';
	var secondAlt = 'Alt Text 02';;

	// Toggle image based on current SRC.
	if (currentImage == firstImage) {
		toggleBanner.setAttribute('src', secondImage);
		toggleBanner.setAttribute('alt', firstAlt);
	} else {
		toggleBanner.setAttribute('src', firstImage);
		toggleBanner.setAttribute('alt', secondAlt);
	}
}
</script>

<img id="sourceBanner" onclick="toggleImage();"
	style="cursor:pointer;" alt="Alt Text 01"
	src="/images/banner_01.jpg" />

I am open to any tips or improvements.