How to export java applet content to excel

Hi,
   I have created applet which generates graph for given data in bar graph or pie-chart.I embed this applet with .net code.I m able to display this graph on web page.Now i want to transfer this graph to excel but m fail to do this . Table with data gets transfer properly but wen m transfering graph its not getting disply as image it jst show logo of java applet. Please help me out to solve the problem.
I want the solution with out using Dll.
Thnx
Archana