Math.round is best option but I had to move the closing bracket  
 
from 
Math.round(Math.sqrt(dist*dist/2)/2)) 
to 
Math.round(Math.sqrt(dist*dist/2))/2) 
 
Thanks again :). I'm trying to take next step, but for me it is sci-fi :-D. Your support helped me a lot. 
 
Marius 
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