How to use custom WrkTaskIp.aspx page in custom sharepoint workflow ?

Question

I have created as custom task edit browser enabled Infopath form which successfully gets open when user clicks on Edit task. But by default it opens up in the WrkTaskIP.aspx page which is available in 12 hive..Layouts folder.

Now the default WrkTaskIP form provides two following options as hyperlinks 1. Delete item, and 2. A link to navigate to the task display form

I want to customize the OOB, WrkTaskIP page and associate that with my workflow.

How exactly can i achieve this ?

Thanks.