Function that inserts tables

[uzibalqa]

I have a function in which I am doing

   (table-insert 15 3 5 1)

   (table-insert-sequence "1" 15 1 1 'center)

Beneath the first table, I want to have another table

  (table-insert 16 3 5 1)

  (table-insert-sequence "16" 16 1 1 'center)

But the second part is messing up the first table.  What can I do to get two 
tables inserted?