How to use a gpointer?

["Christian B. Westermann" <christian westermann phim unibe ch>]

Can anybody show me how to use a gpointer. In the following example I
want to use the variable 'value' in my function 'handle_value'. I filled
the spaces with ??? where I don't know how to do it.

-------------------------------------
int value=10, *value_ptr;
value_ptr=&value;
.
.
.
gtk_signal_connect(GTK_OBJECT(button),"clicked",				
GTK_SIGNAL_FUNC(handle_value),(gpointer)???);
.
.
.
static void handle_value(GtkWidget *widget,gpointer data)
{
int the_value;

the_value=??????data; 

printf("%i",the_value);
}
-------------------------------------
Thank you
Chris
-- 
====================================================================
Ch. B. Westermann

University of Bern         
Physikalisches Institut      
Sidlerstrasse 5            phone: +41(0)31 6314417
3012 Bern                    fax: +41(0)31 6314405
Switzerland                email: christian.westermann@phim.unibe.ch
 			   http://phimcasymir.unibe.ch/casymir/cas_SS.html