Hello again! 
  
  
  
I have no duplicate IDs but in my search for the error I have made a new discovery. 
  
  
  
to get my chart to render at my site I use: 
  
 
<%= Chartfunction(550 , 300 , "ChartId") %>
 
  
  
  
and this is placed inside several asp:Panel tags to get the right design on the page.  
  
If I put the  
<%= Chartfunction(550 , 300 , "ChartId") %>
 outside these Panels I can do an export. Otherwise I get an javascript error. Still only in IE, not FF?? 
  
  
  
What could be the problem? 
  
  
  
Sorry for my terrible english. 
  
Regards! 
  
  
  
/Mats