> how can i show on map the route from point $c1,$c2 to $cp1,$cp2?

$c1 etc, are not even mentioned in your code dump.  What are they?

> and i can show also step-by-step indications in italian?

Yes.
http://groups.google.com/group/Google-Maps-API/browse_thread/thread/d93d3b3ae7a5ed85/9383b1f5fd578cc4?lnk=gst&q=GDirections+language#9383b1f5fd578cc4
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