Jargone popup does not appear when using gov.uk/designprinciples/

[rooreynolds]

https://www.gov.uk/designprinciples/styleguide#item_4_1_3

Notes popup should appear for agenda, collaborate, etc etc. Fails silently.

[rooreynolds]

It's probably to do with the offsetLeft and offsetTop stuff. No doubt my hacky js+css could use some work. :-)

[rooreynolds]

Fixed by bfbab11