php - Saving image with GD Handle -

i working on website used displaying scores in several benchmarks. in order accomplish this, using php(duh :d) database queries , jpgraph library, creates graph , displays , image gd library.

the user of site can select chart wants see <form> contains following criteria:

1. the client ran test
2. the operating system client used @ time
3. the benchmark used
4. and type of chart wants see (bar graph, line graph....)

all of works fine, graph displayed without problem in <iframe> supposed in.

however, want user able save graph, with, second button. can gd handle of image, how can use save image file on client?

any welcome.

regards,
andy