(function($){
$.fn.checkers = function(rowsize, darkClass, lightClass) {
	
	var invert = false;
	$(this).each(function(i) {
		if ((i%rowsize) == 0)
			invert = (invert) ? false: true;

		if ((i%2) == 0)
			$(this).addClass((invert) ? darkClass : lightClass);
		else 
			$(this).addClass((invert) ? lightClass : darkClass);
	});
	
}
})(jQuery);