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We examine cross sections for the processes $\gamma N\to NK\bar{K}$ in theframework of a phenomenological Lagrangian. We include contributions from$\Lambda$ and $\Sigma$ resonances up to spin 3/2, as well as those from anexotic $\Theta^+$. We allow the $\Theta^+$ to have spin 1/2 or 3/2, with eitherpositive or negative parity in each case. We also allow the state to be eitherisovector or isoscalar. We find that the scenario that most closely matchesobservations at Jefferson Laboratory requires a moderately large coupling ofthe $\Theta^+$ to $NK^*$.Comment: 22 pages, 16 figures, one style file replaced to fix figure

Phenomenological Lagrangian approach to two kaon photoproduction and pentaquark searches