Magic8Computing

I have an ASP page that creates an xml page with the data to plot the chart. but the user wants a trendline like the one you get in excel. does anybody know how i can get this.

Thankyou. I have looked at this but that only allows really what i would class as a target line and i am after instead a trend for the plots on the graph what excel refers to as linear regression trendline. can you help at all with this, i hope so. Matthew