Seems that there has been a change in how Orion displays the graphs. Not only are all URLs different from before (added a /Orion before NetPerfMon) so I have to update all systems, but also it seems difficult to display only the graph in an overview page.
What I try to do is to have 4 graphs from my border routers towards Internet displayed on the same page. I did this by making a custom HTML page, and add stuff like
<a href=(link to 30 days graph)>
<img src="/Orion/NetPerfMon/Chart.asp?Chart=MMAVGBPS&NetObject=I:12180&Period=Last 3 days&SampleSize=30M&ReBuild=TRUE&FontSize=Medium&Width=490&Height=0" border="0"
alt="Last 30 days">
</a>
Now, the link is OK, but I can't seem to display the graph I want (get a red cross). If I change to Chart.aspx at least I get a "A chart type has not been selected". Could someone guide me?