var min_image_id = 1;
var max_image_id = 11;

function image_rotate(moveid){
  if((image_id + (moveid))<=max_image_id && (image_id + (moveid))>=min_image_id)
    set_image(image_id + moveid);
  else if((image_id + (moveid))>max_image_id)
    set_image(min_image_id);
  else if((image_id + (moveid))<min_image_id)
    set_image(max_image_id);
}

function set_image(new_id){
  document.images['mainimage'].src="../files/sm_home/" + new_id+".jpg";
  image_id = new_id;
}

function getrandom(min_random, max_random) { 
  max_random++;
  var n=Math.floor(Math.random() * (max_random - min_random + 1)) + min_random; 
  return n; 
}


var image_id = getrandom(min_image_id, max_image_id);
set_image(image_id);