/*

Link Thumbnail v2.0.1
(c) Arc90, Inc.

http://www.arc90.com
http://lab.arc90.com

Licensed under : Creative Commons Attribution 2.5 http://creativecommons.org/licenses/by/2.5/

*/

/* Globals */
var arc90_navigator = navigator.userAgent.toLowerCase();
var arc90_isOpera = arc90_navigator.indexOf('opera') >= 0? true: false;
var arc90_isIE = arc90_navigator.indexOf('msie') >= 0 && !arc90_isOpera? true: false;
var arc90_isSafari = arc90_navigator.indexOf('safari') >= 0 || arc90_navigator.indexOf('khtml') >= 0? true: false;
var arc90_linkThumbUseClassName = true;

var arc90_linksources = [['http://images.websnapr.com/?size=s&url=', 202, 152],
              ['http://thumbnails.alexa.com/image_server.cgi?size=small&url=', 160, 120],
              ['http://msnsearch.srv.girafa.com/srv/i?s=MSNSEARCH&r=', 160, 120]];
var arc90_linksource = 0;

function arc90_linkpic() {
  var b = document.domain;
  var A = document.getElementsByTagName('A');

  for (var i = 0, l = A.length, c = 0; i < l; i++) {
    var a = A[i];
    var h = a.href;
    if ((b == '' || h.indexOf(b) < 0) && h.indexOf('://') > 0 && ((arc90_linkThumbUseClassName && a.className.indexOf('thumbnail') >= 0) || !arc90_linkThumbUseClassName)) {
      try {
        a.className += ' arc90_linkpicLNK';
        if (a.id == '')
          a.id = 'arc90_link'+ i;
        var d = arc90_newNode('div', 'arc90_linkpic'+ i, 'arc90_linkpic');
        var m = arc90_newNode('img', '', 'arc90_linkpicIMG');
        // var n = h.replace(/[^:]*:\/\/([^:\/]*)(:{0,1}\/{1}.*)/, '$1');
        var n = escape(h);
        m.src = arc90_linksources[arc90_linksource][0] + n;
        m.width = arc90_linksources[arc90_linksource][1];
        m.height = arc90_linksources[arc90_linksource][2];
        m.style.width = arc90_linksources[arc90_linksource][1] +'px';
        m.style.height = arc90_linksources[arc90_linksource][2] +'px';
        m.border = 0;
        m.alt = '[Picture of '+ n +']';
        m.title = a.title;
        d.style.zIndex = '9999';
        d.style.position = 'absolute';

        d.appendChild(m);
        document.body.appendChild(d);

        arc90_addEvent(a, 'mouseover',  function () { arc90_showThumb(arc90_isIE? event.srcElement.id: this.id); } );
        arc90_addEvent(a, 'mouseout',  function () { arc90_hideThumb(arc90_isIE? event.srcElement.id: this.id); } );
      } catch(err) {
        a = null;
      }
    }
  }
}

function arc90_showThumb(id) {
  try {
    var k = document.getElementById(id);
    var top = arc90_findDimension(k, 'Top');
    var lnh = arc90_getStyle(k, 'lineHeight', 'font-size');
    var default_height = 20;

    if (!lnh)
      lnh = default_height;
    else if (lnh.indexOf('pt') > 0)
      lnh = parseInt(lnh) * 1.3;
    else if (lnh.indexOf('em') > 0)
      lnh = parseInt(lnh) * 10;
    else if (lnh.indexOf('px') > 0)
      lnh = parseInt(lnh);
    else if (arc90_isNumeric(lnh))
      lnh = parseInt(arc90_isIE? lnh * 10: arc90_isOpera? lnh/100: lnh); // IE brings back em units
    else
      lnh = default_height;
    var lft = arc90_findDimension(k, 'Left');
    var nlf = arc90_findMatchingDimensionViaNodes(k, 'Left', lft, 0);
    var pid = id.replace(/arc90_link/, 'arc90_linkpic');
    var p = document.getElementById(pid);
    p.style.display = 'block';
    p.style.top = (top + (arc90_isIE && nlf? lnh + 8: 4) + lnh) + 'px';
    p.style.left = lft + 'px';
  } catch(err) { return; }
}

function arc90_hideThumb(id) {
  try {
    var k = document.getElementById(id);
    var pid = id.replace(/arc90_link/, 'arc90_linkpic');
    var p = document.getElementById(pid);
    p.style.display = 'none';
  } catch(err) { return; }
}

function arc90_getStyle(obj, styleIE, styleMoz) {
  if (arc90_isString(obj)) obj = document.getElementById(obj);
  if (obj.currentStyle)
    return obj.currentStyle[styleIE];
  else if (window.getComputedStyle)
    return document.defaultView.getComputedStyle(obj, null).getPropertyValue(styleMoz);
}

function arc90_findDimension(obj, pType) {
  if (arc90_isString(obj)) obj = document.getElementById(obj);
  var cur = 0;
  if(obj.offsetParent)
    while(obj.offsetParent) {
      switch(pType.toLowerCase()) {
      case "width":
        cur += obj.offsetWidth; break;
      case "height":
        cur += obj.offsetHeight; break;
      case "top":
        cur += obj.offsetTop; break;
      case "left":
        cur += obj.offsetLeft; break;
      }
      obj = obj.offsetParent;
    }
  return cur;
}

function arc90_findMatchingDimensionViaNodes(obj, pType, matching, notMatching) {
  var cur = 0, counter = 0;
  notMatching = notMatching == null? -1: notMatching;
  if(obj.parentNode)
    while(obj.parentNode) {
      cur = arc90_findDimension(obj, pType);
      if (cur == matching && cur != notMatching)
        counter++;
      if (counter >= 2) return true;
      obj = obj.parentNode;
    }
  return false;
}

/* Events */
function arc90_isString(o) { return (typeof(o) == "string"); }

function arc90_isNumeric(o) { return (typeof(parseFloat(o).toString() == 'NaN'? 'xxx': parseFloat(o)) == "number" && parseFloat(o) != ''); }

function arc90_addEvent(e, meth, func, cap) {
  if (arc90_isString(e))  e = document.getElementById(e);

  if (e.addEventListener){
    e.addEventListener(meth, func, cap);
      return true;
  }  else if (e.attachEvent)
    return e.attachEvent("on"+ meth, func);
  return false;
}

/* Nodes */
function arc90_newNode(t, i, s, x, c) {
  var node = document.createElement(t);
  if (x != null && x != '') {
    var n = document.createTextNode(x);
    node.appendChild(n);
  }
  if (i != null && i != '')
    node.id = i;
  if (s != null && s != '')
    node.className = s;
  if (c != null && c != '')
    node.appendChild(c);
  return node;
}

/* Onload */
arc90_addEvent(window, 'load', arc90_linkpic);