Modifying a page and not creating a new one

Hello, I am a new user...

Here is an example. The result appears in a new page. How to put it in the 
index page ?

Thank you.

----------------------------------------
import cherrypy
import os


class monSite:

#---------------index
@cherrypy.expose
def index(self) :
output="""

<br>
<form action="somme" method="GET">
<input type=number name="a" /> + 
<input type=number name="b" /> 
<input type="submit" value="=" />
</form>
<br>
<br>
"""
return output


#-------------- somme
@cherrypy.expose
def somme(self,a=0,b=0):
r=int(a)+int(b)
output=str(r)
return output

cherrypy.quickstart(monSite())

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