The Dink Network

Why does the following script not work? Dink says "It's here" whether the sprite is visible or not, and I can't work out what I'm doing wrong.

void main (void)
{
int &here = sp_nodraw(&current_sprite, -1);
//uncomment following line to test
//sp_nodraw(&current_sprite, 1);
}

void talk (void)
{
if (&here == 0)
{
say("It's here!", 1);
}
}