Form Math Processing - Intermediate page?

[ringartdesign]

I have a form that takes about 5-10 seconds on average to process the php math and return the math answer. The form and php math work perfectly, but while the php math is being processed, the page goes blank for the 5-10 seconds and then starts loading the page design and math solution. I was wondering if there is a way to program this so that there is an intermediate page, kinda like the way airline ticket price searches use, telling the user that their information is being processed and to hold on?

[genericnumber1]

Try echoing something, do flush(), do the processing, and then echo a javascript redirect... There are other ways I would do it (eg. ajax or pass it to a different process to do the calculating) but they're more complicated.