Can Roku do this?

It isn't really clear from what you posted exactly what you are trying to accomplish. Do you want a Roku screen that updates every few minutes? Do you want an image that updates every few minutes? As you probably know, a Roku can't really display a web (html) page. Instead, the Roku can take XML data and render that in many different ways. To do something on a timer, one can easily create a timer and perform an action on a regular schedule:

timer=createobject("rotimespan")
timer.mark()

while true
     if timer.totalseconds() > 60 then 
          doMyThing()
          timer.mark()
     end if
end while