imobilser/key problem?? PLEASE HELP!! :)?

the key for my clio has broken..the button for the central locking, and also essentially for the immobilser is now non-existent. I can create a contact on the button by using a small flat blade screwdriver, this allows me to open and the lock the central locking but unfortunatley i can't activate and deactivate the immobilser by doing this.

With this problem i cannot start the engine as the immobilser keeps cutting the fuel pump :(. ANY IDEAS WHAT I SHOULD DO??