Airy Pattern

[theneedtoknow]

How would I come up with an equation (in one dimention), for the airy pattern of a telescope with a given diameter observing at a given wavelength? something that looks like this
http://upload.wikimedia.org/wikipedia/commons/9/93/Airy_Pattern.svg
I want to be able to plot Intensity in the image versus the angle from the normal, in one dimension.

[Chronos]

I tend to avoid wike as a source, but, this is a pretty good overview:
http://en.wikipedia.org/wiki/File:Airy_Pattern_Intensity_and_Encircled_Power.sv g