Drawing a graph by script

[Mark Swindell]

What would be the best way to draw a simple graph by script?

All I need is a rectangle with horizontal lines drawn across it at the  
correct intervals (height/100) or whatever the number of lines is to  
be.  I've been looking in the docs but still not sure how to implement  
this.   I also played around with using a list field and setting the  
line height, but this isn't as accurate as I'd like.

Thanks,
Mark