You'll have to write your own based on a solid understanding of the IAT's D measure (cf. Greenwald et al., 2003). Or you can simply use the D scores computed by Inquisit in as recorded your data files if that's all you are interested in (cf. http://www.millisecond.com/forums/Topic3444.aspx).
Hello, I had recently conducted a study using the Inquisit 3 program to administer an IAT, however I do not have access to the SPSS program to analyze the data using the SPSS script they had provided. I was wondering whether there were alternatives to the SPSS script that would provide the same data except on different statistical programs such as Fathom or Jmp. Thank very much