Language similar to this should do ya. Caveat: IANAL.
"CLAUSE NO. .. - INTELLECTUAL PROPERTY INDEMNITY
"Client warrants that the use, or incorporation into Client's website of all content supplied to Designer shall be free and clear of infringement of any valid copyright, trade mark, mask works, or other proprietary rights. Client shall hold Designer harmless from any and all expenses, liability, and loss of any kind, including but not limited to attorney’s fees, all costs, expenses, and fees arising from claims, suits, or actions alleging such infringement, which claims, suits, or actions Seller agrees to defend."