Substracting width only from the right side

I know I'm not the master of thread titles, so here's an example.

I'm developing a UI backend to use in my new game (That Namelezz Game), but the HP bar should not shrink from both directions, only from right.

Here's a screenie:

HP is 100 - Width is then 100.

<img src="http://img341.imageshack.us/img341/7443/normalhpmm8.png">

HP is lost and width is lost - but it shrinks the sprite from both sides!

<img src="http://img341.imageshack.us/img341/4441/losthpli6.png">

How can I make it so the width only gets substracted from the right?

EDIT:

Just as I finished writing I just changed the hotspot to the left corner and it worked, nevermind

If you use Sprite to render this counter:

Try putting Pivot Point in the top-left corner

If you use Box for example named MyBox or any other object:

I'd recommend using Sprite showing bar when full

But you can also always set this MyBox's X position. Let's say Box's starting X position is stored in value ('startX') and starting width in value ('startWidth'). Then in events you can make:

Event #1:

Conditions:

-> Always (every tick)

Actions:

-> MyBox . Set X Position to: MyBox('startX') - (MyBox('startWidth') - MyBox.Width) / 2.

Maybe there are more optimal solutions but I don't mind wasting 1000 CPU cycles per frame ^^.

Yes, the pivot point trick worked! Thanks.

Now JAWS (Just Another Window System) is even greater