[TYPO3] getting rid of onfocus="blurLink(this);

[tapio]

Ries van Twisk wrote:
> klaus brinch wrote:
> 
>> Hi
>>
>>
>> I have gotten rid of the javascript but i still have this with alle my 
>> links: onfocus="blurLink(this)
>>  
>>
> See this page: 
> http://typo3.org/documentation/document-library/doc_core_tsref/TMENU/
> and the noBlur option
> 
> config.noBlur = 1 shoulds work aswell for the complete site.

what is the idea of 'onfocus="blurLink(this)'?
Why Typo3 puts it as default?