I use ArcGIS 10
I want to use an arcscript to compute an index of ruggedness for each cell of my map. For this purpose, I found, Evan's TRI.aml script here:
<http://arcscripts.esri.com/details.asp?dbid=12435>

I have never added a script to ArcGIS before. So I downloaded it, and aded to as a script to my newly created toolbox. 
However, I do not know what to enter when I am asked to add parameters, and if I don't add any I cannot use the script when I double click on it. 

No specific indication on "parameters" is available on the website from which I downloaded the aml file.