some students use multiple rollover for their navigation. when you view your page using FireFox, you will see blue outlines around the image link. How to take the outlines off of images links?

1: give one extra attribute for <img src=".."> tag as border="0"
that will remove the border for Link images!  So the tag will look like:

<a href="mylocation.html"><img src="myImage.jpg" border="0"></a>

2: Or, you can use CSS:
img
{
border-style: none;
text-decoration: none;
}

add that to your CSS file.