[Eq4bits]

in addition, after further investigation:
when the page loads that has this effect added to it's template
in IE7
there's a notice at the bottom in bar that it is 'Done' but with errors on page
details of error:
Line 356
Char 5
Error Object required
Code 0
then when looking at page source via code editor :
lines 355-358:

PHP Code:

  } else if (ie4up) {
    doc_width = document.body.clientWidth;
    doc_height = document.body.clientHeight;
  } 


line 356 being the doc_width code