/* $Id$ */

var curr_img='';
var curr_idx=0;
var last_idx=0;

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

function onNextImg() {
  if (last_idx>0) {
    curr_idx--;
    if (curr_idx<1) {
      curr_idx = last_idx;
    }
    curr_img = curr_img.substring(0,curr_img.length-5)+curr_idx+'.jpg';
    document.getElementById('product-view').src = curr_img;
  }
  return false;
}

function setCallbacks() {
  document.getElementById("next-image").onclick = onNextImg;
  curr_img = document.getElementById('product-view').src;
  curr_idx = last_idx = parseInt(curr_img.substring(curr_img.length-5,curr_img.length-4));
}


addLoadEvent(setCallbacks);