Activemenus + Garland in IE6 can only collapse nodes

Ok I've found the problem: In the click handler for collapsed nodes that haven't been loaded, you do this:

var offset = Drupal.mousePosition(e).x - Drupal.absolutePosition(this).x;
// Determine if we are in the selection area.
if (offset < (0 + parseInt($(this).css('padding-left')))) {

In most browsers, .css('padding-left') returns the computed value in pixels, however in IE returns it in its original format, so for the garland theme we get "1.5 em", which is parsed as 1 pixel, and is hence impossible to click.
I suggest just using a hardcoded value if .css('padding-left') isn't in pixels, like so:

var offset = Drupal.mousePosition(e).x - Drupal.absolutePosition(this).x;
var padding = $(this).css('padding-left');
// Determine if we are in the selection area.
if (offset < (padding.slice(-2) == "px" ? parseInt(padding) : 18)) {

Note that 18px is the actual value of .css('padding-left') when using the Garland theme, as well as being a reasonable default.
I've attached a patch which does exactly this. Please review/checkin the fix to the other IE7 issue, while you're at it: http://drupal.org/node/140622

For reference, I tried another approach that first tries to multiply em values by the font-size, but this in turn assumes that the font-size is in pixels, so probably isn't worth it (e.g. what if the font-size is "150%"!)

var offset = Drupal.mousePosition(e).x - Drupal.absolutePosition(this).x;
var padding = $(this).css('padding-left');
var multiplier = padding.slice(-2) == "em" ? parseInt($(this).css('font-size')) : 1;
padding = parseFloat(padding) * multiplier;
// Determine if we are in the selection area.
if (offset < (isNaN(padding) ? 18 : Math.max(padding, 18))) {

Accurately converting between css length values is horrific and requires inserting a hidden div to the DOM!

Forgot to mention I tested in Fx1.5, Fx2, IE6, IE7 and Opera9 (on Windows) in each of Garland, Pushbutton and Bluemarine and it works fine (with my patch to http://drupal.org/node/140622 and ignoring the existing bugs http://drupal.org/node/140620 and http://drupal.org/node/140585)