3 examples of 'jquery-1.4.2.min.js download' in JavaScript

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function loadjQuery(url, callback) {
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  var script_tag = document.createElement('script');
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  script_tag.setAttribute("src", url)
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  script_tag.onload = callback; // Run callback once jQuery has loaded
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  script_tag.onreadystatechange = function () { // Same thing but for IE... bad for IE 10, it supports all
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    if (this.readyState == 'complete' || this.readyState == 'loaded') {callback();}
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  }
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  script_tag.onerror = function() {
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    loadjQuery("http://code.jquery.com/jquery-1.8.2.min.js", main);
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  }
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  document.getElementsByTagName("head")[0].appendChild(script_tag);
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}

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function download(url) {
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    torrents[url] = true;
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    // If the torrent already exists, kick off the downloads of the files, as this
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    // won't happen naturally when the torrent is added (because it already exists!)
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    if(btapp.has('torrent')) {
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        if(btapp.get('torrent').each(function(torrent) {
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            if(torrent.has('properties')) {
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                if(torrent.get('properties').get('download_url') === url) {
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                    download_torrent_files(torrent.get('properties'));
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                    return;
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                }
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            }
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        }));
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    }
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}

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function loadJQuery() {
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	if(!window.jQuery) {// load only if its required as it is giving problem on many pages.
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		addLibrary("/thirdparty/pratikabu-jquery.js", function(result) {
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			eval(result);
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			pratikabusttjquery = window.jQuery.noConflict(true);// this line will replace any existing mapping of $ and jQuery on the current page
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			loadCompleteFile();
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		});
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	} else {
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		pratikabusttjquery = window.jQuery;
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		loadCompleteFile();
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	}
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}