need help for circuit

[fdsaman]

http://farm3.static.flickr.com/2263/1524145243_88f46cb1ee.jpg
1. The problem statement, all variables and given/known data

can anyone tell me the way to caculate the v1, v2 and v3 shown in the picture?thankyou ><

2. Relevant equations

v1, v2 and v3.

3. The attempt at a solution

[berkeman]

I would use the Kirchoff Current Law (KCL -- the sum of all currents out of a particular node is equal to zero). Write the KCL equations for all of the nodes in the circuit, and then solve those simultaneous equations for the unknown voltages.