I tried to follow the steps from crawlingroad.
But i couldn’t find the message within jquery.mystique.js nor
the file jquery.mystique.min.js.
I do assume digitalnature has changed the implementation of the browser warning within the latest update of the theme.
The Mystique Theme provided by digitalnature is great.
It would be even greater, if it would allow to change, translate or switch off the implemented IE6 Browser warning.