/*

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],
                          ['http://mozshot.nemui.org/shot?', 128, 128]];
var arc90_linksource = 3;

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('linkthumb') >= 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] + h;
                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 + 0: 20) + 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);