[Javascript] image swap

[Jeffrey Morin]

hi everyone,

i am just starting to learn JavaScript and could really use some help. i am trying to do an image swap code with onmouseover. i am just copying and pasting the code out of a book but can't figure out what to change in order to get it to work. it is from the o'reilly JavaScript book. here is the code:

<script type="text/javascript">
function rollOver()
{
var images = document.getElementsByTagName("img");
for(var i = 0; i < images.length; i++);
    {
    var image = images[i];
    var rolloverURL = image.getAttribute("rollover");
    if (rolloverURL) addRollover(image, rolloverURL);
    }
}    
</script>
<script>
if (window.addEventListener)
    window.addEventListener("load", rollOver, false);
else if (window.attachEvent)
    window.attachEvent("onload", rollOver);    
</script>

so the first part is the actual function and the second calls it right? my question is which parts need to be modified. i have tried entering url's and still get nothing. the latest error i get  is that the image has no properties. can someone help me out with this. i would really appreciate it. i was told JavaScript was fairly easy to learn, i think i was lied to.

Jeff

       
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