NZ Prime Minister Helen Clark has laughed off suggestions on billboards in Auckland that she is like Fiji's Commodore Frank Bainimarama.

With the controversial Electoral Finance Act just one day old in NZ, its opponents began testing its boundaries. The Dominion Post said the Free Speech Coalition launched a billboard campaign against the parties that supported the Act and immediately called for a ruling on whether it would comply with the law when it comes into force on the 1st of next month.

Coalition spokesperson and right wing blogger, David Farrar said the billboards targeted Clark, NZ First Leader Winston Peters and United Future Leader, Peter Dunne.

Clark's Auckland billboard pictures Bainimarama saying "I salute Helen Clark's anti-democracy plotters. The Electoral Finance Act is a real coup".

Clark took it as a joke, saying and we quote "You've got to laugh haven't you. We have a country with the most amazing liberty and I will defend that to my last breathing moment," end of quote.

The coalition's billboard campaign comes after the NZ parliament passed the Electoral Finance Bill which puts a $120,000 cap on the amount third parties can spend on election advertising. Anyone wanting to spend more than $12,000 to advocate against a candidate, has to register with the Electoral Commission or they would be breaking the law.