var image_dir = "images/";
var ImageNum = 0;
var TotalNum = 0;

imageArray = new Array();
imageArray[ImageNum++] = image_dir + "gcarnaval09_1.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_2.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_3.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_4.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_5.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_6.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_7.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_8.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_9.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_10.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_11.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_12.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_13.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_14.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_15.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_16.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_17.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_18.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_19.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_20.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_21.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_22.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_23.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_24.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_25.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_26.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_27.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_28.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_29.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_30.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_31.jpg";
imageArray[ImageNum++] = image_dir + "gcarnaval09_32.jpg";

TotalNum = ImageNum;
ImageNum = -1;

function AvanzaImage()
{
   ImageNum++;
   if (ImageNum == TotalNum)
     ImageNum=0;
   document.mainimage.src = imageArray[ImageNum];
}

function RetrocedeImage()
{
   ImageNum--;
   if (ImageNum == -1)
     ImageNum= TotalNum - 1;
   document.mainimage.src = imageArray[ImageNum];
}