function fade(step, dir, img) {
            var imgs = document.getElementsByTagName("img");

            step = step || 0;
	    if(!img) img = 1;
	 	    
            imgs[img].style.opacity = step/100;
            imgs[img].style.filter = "alpha(opacity=" + step + ")";

	    
	    if(!dir) {
	    	
		step += 2;
	    	if (step >= 100) {
			
			if(img >= 3) {
				if(dir) dir = 0; else dir = 1;
				img = 3;
			} else {
				img++;
				step = 0;
			}
			
			window.setTimeout(function () { fade(step, dir, img); }, 3000);
			
						
		} else {
			window.setTimeout(function () { fade(step, dir, img); }, 1);
		}
		
	} else {
		
		step -= 2;
		if (step == 0) {
			
			if(img <= 1) {
				if(dir) dir = 0; else dir = 1;
				img = 1;
			} else {
				img--;
				step = 100;
			}	
			
			window.setTimeout(function () { fade(step, dir, img); }, 3000);
			
			
			
			
		} else {
			window.setTimeout(function () { fade(step, dir, img); }, 1);
		}
	}
	
	
	
}