Don't point to quickly to javascript on my site. I know i'm not flawless, i also know you're not

I've found the error, it's in your index.php code.
If you have a function that inserts a value (if exist) then be sure to put the delimiter on the correct side.
Original
Code:
BoxHeights.equalise(<?php if($showuser[5]) { ?>'c1',<?php } if($showuser[6]) { ?>'c2',<?php } if($showuser[7]) { ?>'c3'<? php } ?>);
Gives this error with only user5 and 6 occupied:
syntax error BoxHeights.equalise('c1','c2',);
Due to the extra delimiter at the end.
Corrected
Code:
BoxHeights.equalise(<?php if($showuser[5]) { ?>'c1'<?php } if($showuser[6]) { ?>,'c2'<?php } if($showuser[7]) { ?>,'c3'<?php } ?>);
Now it works like a charm.