Two schemes for tuning the scattering length on the ground triplet state of Cs-2 are developed. The absolute value of the triplet scattering length of Cs-133(2) is determined from the experimental data [A. Fioretti, D. Comparat, C. Drag, C. Amiot, O. Dulieu, F. Masnou-Seeuws, and P. Pillet, Eur. Phys. J. D 5, 389 (1999)], we demonstrate that the large scattering length can be made small and positive by coupling the (3)Sigma (+)(u)(6S+6S) potential to the (3)Pi (g) state by strong off-resonant radiation. A weaker laser field coupling the (3)Sigma (+)(u)(6S+6S) continuum to the lowest bound level of the excited (3)Sigma (+)(g)(6S+6P) state also leads to a small positive scattering length. The scattering length of the Cs-135 isotope is found to be positive. The method used solves the Schrodinger equation for two electronic states coupled by an electromagnetic field with no approximations employed. The scattering length is determined from the calculated continuum wave functions at low energies. (C) 2001 American Institute of Physics.