Reg. foreign key tree

Hi,

In one of my projects I have a requirement where I get all the dependent tables for a particular Table.

For Example, say Table A has foriegn key relations to B, C,D
Say Table B has foriegn key relation to E,F,G
Say Table C has Foreign key relation to H,I,G
Table E has foreign Key relation to U, V, W
Table U has foreign key relation to X, Y, Z

Then, is there any way, where if I give Table A, I will get the list of all the tables referencing it (directly or indirectly). The result should retrun all the tables - B, C, D, E, F, G, H, I, G, U, V, W, X, Y, Z

Any system function or piece of code would be great.

Thanks
oursmp