var BannerNavegacao = new Class
({
	Extends: Banners,
	
	previous: function()
	{	
		clearTimeout(this.timeOutId);
		
		--this.currentBanner;
		
		if(this.currentBanner == 0)
			this.currentBanner = this.totalBanners - 1;
		else
			--this.currentBanner;
		
		this.changeBanner(this.currentBanner);
	},

	next: function()
	{
		clearTimeout(this.timeOutId);
		
		if(this.currentBanner == this.totalBanners)
			this.currentBanner = 0;
		
		this.changeBanner(this.currentBanner);
	}
});