After using your example I have one question. Are you spacing the data points as dates or simply as sequential values? For instance for the following data:

(1) 2008/05/04,75
(2) 2008/05/05,80
(3) 2008/05/08,100

How do you print this? Do you evenly space the points or are they at the same distance from each other? Trying to illustrate this:

(1) (2) (3)
(1) (2) ( ) ( ) (3)

Thanks for your feedback.

and this places data points acoarding to the date:
http://www.amcharts.com/stock/data-at-irregular-intervals/