A Pop Up Window

That window that poped up was created by putting code like the following after the <HEAD> and before the </HEAD>:
<SCRIPT language="javascript">
    var color ;

    color = prompt("What color should I use for the background?","") ;

    document.bgColor = color ;

A Fill In Form

The form below was created with code like this:

    <FORM NAME=formone>
    <INPUT NAME=color TYPE="TEXT" SIZE=20>
    <INPUT TYPE="BUTTON" VALUE="Change the background color!"

Mouse Over Picture Change

    <A href=""
        <IMG SRC="univ2.jpg" NAME="one">