/** 
*  Script lazy loader 0.5
*  Copyright (c) 2008 Bob Matsuoka
*
*  This program is free software; you can redistribute it and/or
*  modify it under the terms of the GNU General Public License
*  as published by the Free Software Foundation; either version 2
*  of the License, or (at your option) any later version.
*/

var LazyLoader = {}; //namespace
LazyLoader.timer = {};  // contains timers for scripts
LazyLoader.scripts = [];  // contains called script references
LazyLoader.load = function (url, callback) {
    // handle object or path
    var classname = null;
    var properties = null;

    // make sure we only load once
    /*if (LazyLoader.scripts.indexOf(url) == -1) {*/

    // note that we loaded already
    LazyLoader.scripts.push(url);
    var script = document.createElement("script");
    script.src = url;
    script.type = "text/javascript";
    $("head")[0].appendChild(script);  // add script tag to head element

    // was a callback requested
    if (callback) {
        // test for onreadystatechange to trigger callback
        script.onreadystatechange = function () {
            if (script.readyState == 'loaded' || script.readyState == 'complete') {
                callback();
            }
        }
        // test for onload to trigger callback
        script.onload = function () {
            callback();
            return;
        }
        // safari doesn't support either onload or readystate, create a timer
        // only way to do this in safari
        /*if (Prototype != "undefined" && Prototype.Browser.WebKit && Prototype.Browser.Opera) { // sniff
        LazyLoader.timer[url] = setInterval(function() {
        if (/loaded|complete/.test(document.readyState)) {
        clearInterval(LazyLoader.timer[url]);
        callback(); // call the callback handler
        }
        }, 10);
        }*/
    }
    /*		} else {
    if (callback) { callback(); }
    }*/
}