Set random albums default to another number from 10

[j3tblk]

I want to set my default from 10 to 15 random albums to be displayed. I've seen posts on a line to change in index.jsp &home.jsp but it looks like the code has changed. Can someone please point me to the code that tells the system that 10 is the default number of albums to display?
I've been digging around and breaking things but haven't found it.
Thanks