var doChange = 0;
var rotInAction;


function startRotator(img_name ,img_src){
	trailerRotator(img_name, img_src, 3);
}

function stopRotator(img_name, img_src){
    clearTimeout(rotInAction);
}

function trailerRotator(img_name ,img_src, i) {	
	var secImage = (i) + 't.jpg';

	document[img_name].src = img_src + secImage;
	i++;
	if (i>5) i = 3;
	rotInAction = setTimeout(function(){trailerRotator(img_name ,img_src, i)}, 1000);
}