[SOLVED] Left alignment of image in page not correct... and how to overlay title

On this page: http://www.catalystsatwork.com/working-with-groups/ I am trying to align a picture to the left. As you can see it is just not quite right. There's a small margin on the left which causes it to overlap the sidebar on the right.

Could anyone thrown any light on how I achieve this?

Once I've got this fixed, I want to overlay the title text in a controlled manner over the image - having the ability to play with its position and layout ideally.

Can anyone help on that score too?

Huge thanks...
Graham