Renault Megane 1.4 2003 Washer Jets?

hi,
i was topping up my washer fluid recently with everything in fully working order and after topping up the fluid, attempted to use the front jets, electric wipers come on and nothing happens i can hear the jets trying to work and then the fluid comes out the rear onto my back window, then i tried the rear jets and they work perfectly, so basically my front jets are not working and when i attempt this the fluid comes out the back instead???? does anyone have any idea on what this could be? i would be very greatful, thanks

Tom
April 2008