Problem with low beams and High Beams

[thebarbrr]

The furthest position is hi beams, the normal position "'middle" is also hi beams, andonly when I pull back is it in low beams. If I pull back it sort of locks but goes back to middle on its own. Any idea what's going on or what happened? Will a regular mechanic know or will I have to take it to somewhere where they do electrical work? I would loveto find a fix on here with ur guys help but if we can't find a solution then I guess ill have to take it somewhere