[openstreetmap-website] Strange + and - characters on zoom controls (#164)

[Mattias Bengtsson]

:) I see. Been there. 
But ok, I think either adding an option to not set the +/- as chars or to do something like this:
```javascript
if(link.style.background.match("url(") == null) { // or null, undefined or whatever
link.innerHtml = plusOrMinus;
} 
```
...would be the correct fix. 

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/164#issuecomment-10664852
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