To start, here's an example of how to modify the download button in IRs. Just some background on this, we're only supporting CSV downloads now. When the clients would download IRs they would have to click the "Download" link then click on the "CSV" button.
We found this extra step unnecessary so here's a way on how to do it in one step so that it will download as soon as they click "Download". We used jQuery to help out a bit. Here's a working example.
$('.dhtmlSubMenuN[title="Download"]').attr('href','f?p=' + $v('pFlowId') + ':' + $v('pFlowStepId') + ':' + $v('pInstance') + ':CSV:');
Here's a detailed summary of how it works: If you scroll over the "CSV" download button you'll noticed that it looks something like : "f?p=102:3:207941080701500:CSV:". If we break that down it's really: "f?p=
APP_ID = $v('pFlowId');
APP_PAGE_ID = $v('pFlowStepId');
SESSION_ID = $v('pInstance');
Now to alter the "Download" link from the interactive report menu we use jQuery to identify the link: "$('.dhtmlSubMenuN[title="Download"]')" and then use the attr function to set with the new URL.