how can i fix my window washers in my 02 plate vauxhall corsa?

vauxhall corsa 1L comfort
just recently my front and bk window washers dont seem to be working i have made sure theres nothing inside them blocking the water from coming out, i think its somthing do do with the electrics because when i try to use them i can hear a clicking sound from the electric box down the side of the passenger door, it also sometimes effects the passenger side window

can anybody help?

Richard n
January 2005