Newbie and javascript problems

[Ian Maxfield]

Hello all, 

ms4w installed
Windows XP (iis uninstalled)

I have been working my way quite happily through the MapServer 4.6 tutorial,
and have been doing fine until I have tried using the examples that include
javascript.   None of the code that includes javascript will work.  E.g.
when you click on a pan icon to call the javascript function pan(direction),
nothing will happen.  One of the function calls is as follows:

<td align="right" width="18"><a href="javascript:pan('ne')"><img
src="graphics/nw.png" width="18" height="18" border="0" alt="pan
northwest"></a></td>

Should call;

function pan(direction) {
    var x, y;
    if(direction == 'n') {
      x = (400-1)/2.0;
      y = 0 - (300 * pansize)/2.0;
....etc

Tests I have tried:
- created test functions to display alerts
- changed the href to onclick calls
- created new function calls elsewhere in the html document

The javascript looks correct in that when you move the cursor onto the arrow
the screen text at the bottom of the screen displays the function e.g.
javascript:pan('nw'), but then nothing happens on the actual mouse click.

As you can imagine the problem is driving me slightly insane.  Is there
something obvious that I am missing?  Could it be to do with where the ms4w
folder is stored?

Any help would be greatly appreciated,

Ian