How to show an arrow pointer to the Barchart image?

Hi,
I want to show an arrow pointer to the particular value on the barchart, i.e. arrow should point to the y-axis of barchart and should change the position accordingly depends on the value on y-axis. How can I implement this? I want to use this code in JSP?
Thanks,

I understand that you are not talking about an active mouse pointer.
You can write HTML with two < div >s that overlap.
The pointer image should be a .gif (or maybe a .png) with transparency.
Something like this maybe:
< div style="position: relative; top: -10px; background: transparent;"  >You can also generate a composed image, and use another JSP
that acts as if it were an image, using getOutputStream() instead of out,
and setContentType("image/gif") but that is more error prone.
Develop a stand-alone test application first.

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