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//assume variables currentIndex, nextIndex, arrayLength exist

//moving "forward", positive incrementing
nextIndex = (currentIndex + 1) % arrayLength;

//moving "backward", negative incrementing
if(currentIndex == 0){
  nextIndex = arrayLength - 1;
} else {
  nextIndex = (currentIndex - 1) % arrayLength;

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var alphabet=['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];

var rot13 = function(letter){
  var l = letter.toLowerCase();
	
	var index = alphabet.indexOf(l);
	
	var newIndex = (index + 13) % alphabet.length;
	
	return alphabet[newIndex];

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var screenWidth = window.innerWidth;
var visibleElements = jQuery(":visible");
visibleElements.each(function(){
    var $this = jQuery(this);
    if($this.width() > screenWidth){
        $this.css("border", "1px solid green");
        console.log("Screen width is " + screenWidth + " and the following element is " + $this.width(), $this);
    }
});

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/**
 * Logs JavaScript errors via an AJAX request. 
 * Written in pure JavaScript so it does not have any dependencies. 
 */
window.onerror = function(errorMessage, url, lineNumber){
  
	var ajaxUrl = "/log-js-errors?t=" + (new Date()).getTime();
	
	var data = {
		errorMessage: errorMessage,

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javascript:(function(){window.location=window.location.href.replace(window.location.host,(window.location.host+'.libproxy.lib.unc.edu'));})()

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function checkCompatibilityMode(){
    var userAgentRegex = /MSIE ([0-9.]+)/;
    
    var userAgentData = userAgentRegex.exec(navigator.userAgent);
    
    if(userAgentData != null && typeof userAgentData[1] == "string"){
   	 //userAgentData[1] will hold the version number, e.g. "10.0"
   	 if(parseInt(userAgentData[1], 10) != document.documentMode){
   		 $('body').append('<div class="warning">Your browser appears to be in Compatibility Mode. This may cause problems when printing. <a href="http://www.howtogeek.com/128289/how-to-disable-compatibility-mode-in-internet-explorer/" target="_blank">Read how to turn off Compatibility Mode</a>.</div>');
   	 }

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(function(){
    //remove the "Edit" button
	var editLink = document.getElementsByClassName('ss-edit-link');
	if(editLink.length){
		editLink[0].remove();
	}

    //remove the "Google" copyright footer
    var copyright = document.getElementsByClassName('ss-footer');
	if(copyright.length){

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var iframeObjects=$('iframe[title="Recent Announcements "], iframe[title="Announcements "]').contents().find('object');iframeObjects.each(function(){var flashVarsArray=$(this).find('param[name="FlashVars"]').val().split('=');var url=flashVarsArray[1];var url=url.split('&')[0];$(this).after('<div><a href="'+url+'">Link to Download Video</a></div>');});

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/**
 * A class for turning timestamps into more user-friendly relative dates.
 *
$date = new Relative_Date();

echo $date->relative_formatted_date; //"Today"
 */
class Relative_Date {
	
	const DAY = 86400;

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def prevent_widows(text)
  if text.kind_of? String
    trimmed_text = text.rstrip
    last_space_index = trimmed_text.rindex(" ")
    
    if !last_space_index.nil?
      text[last_space_index] = " "
    end
  end