Bookmarklet to scrape links from a 5by5 episode page

5by5showlinks.js

// generates a Markdown list of all the show links on a 5by5 episode page,
// autoselects the result for copying and provides next/prev navigation
// only designed for 5by5, which already has jQuery loaded and matches
// the regex. Customize as needed for other uses.
// Brett Terpstra 2013
var output = "\n\n### Episode "+window.location.href.replace(/.*\/(\d)/,"$1")+"\n\n";
output += "[Show Link]("+window.location.href+")\n\n";
$('#episode_links').find('a').each(function(){ output += "* ["+$(this).text()+"]("+$(this).attr('href')+")\n"; });

// create next/prev links (no boundry checking)
var ep = parseInt(window.location.href.match(/(\d+)$/)[0],10);
var nextLink = $('<a>').attr('href',window.location.href.replace(/\d+$/,ep + 1))
				.text('Next Episode')
				.css({display:'block',padding:'10px',textAlign:'center',backgroundColor:'#ddd','float':'right'});
var prevLink = $('<a>').attr('href',window.location.href.replace(/\d+$/,ep - 1))
				.text('Previous Episode')
				.css({display:'block',padding:'10px',textAlign:'center',backgroundColor:'#ddd','float':'left'});

// generate the overlay element and add text and links
$('<div>').css({
	position:'fixed',
	top: '0',left:'0',right:'0',bottom:'0',
	overflow:'auto',
	backgroundColor:'#efefef',
	color:'#333',
	zIndex:'99999'
}).append($('<pre id="eplinkoutput">').css('padding','20px').text(output)).append($('<div>').append(prevLink).append(nextLink)).appendTo('body');

// select the text in the pre element
var doc = document,
text = doc.getElementById('eplinkoutput'),
range, selection;

if (doc.body.createTextRange) {
    range = doc.body.createTextRange();
    range.moveToElementText(text);
    range.select();
} else if (window.getSelection) {
    selection = window.getSelection();
    range = doc.createRange();
    range.selectNodeContents(text);
    selection.removeAllRanges();
    selection.addRange(range);
}

can yu show me how this script work