Custom YouTube Video Seeking

Adds buttons to YouTube videos to allow custom seeking. It also adds a handy stop start button for stopping to video quickly.
Per 12-08-2014. Zie de nieuwste versie.
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// ==UserScript==
// @name           Custom YouTube Video Seeking 
// @namespace      http://www.diamonddownload.weebly.com
// @description    Adds buttons to YouTube videos to allow custom seeking. It also adds a handy stop start button for stopping to video quickly. 
// @include        http://*.youtube.com/*
// @include        http://youtube.com/*
// @include        https://*.youtube.com/*
// @include        https://youtube.com/*
// @grant          none
// @version        1.1.0
// @run-at         document-body
// @author         R.F Geraci
// @icon64         http://icons.iconarchive.com/icons/designbolts/minimalist-social/64/YouTube-icon.png
// ==/UserScript==

//============CUSTOM SETTINGS============
var showOnPageLoad = false;
//=======================================

var toggle = false;
var btn;
var Tbox;
var SeekBBtn;
var SeekFBtn;
var label;
var CheckBox;
var div;

var p = document.getElementsByClassName('video-stream html5-main-video')[0];
var container = document.getElementById('watch7-user-header');

function stopvidload(){
    
    if (p){
        toggle = !toggle;
        
        if (toggle){
            
            btn.innerText = "Play Video";
            p.pause();
        }else{
            
            btn.innerText = "Stop Video";
            p.play();
        }
    } 
}

function seekForward(){
    if (Tbox.value != "" && Tbox.value > 0){
        var int = parseInt(Tbox.value, 10);
        p.currentTime += int;      
    }
}

function seekBackward(){
    if (Tbox.value != "" && Tbox.value > 0){
        var int = parseInt(Tbox.value, 10);
        p.currentTime -= int;      
    }
}

div = document.createElement('div');
div.id = 'myDiv';
div.setAttribute('style', 'outline: none; display:none; ');
container.appendChild(div);

btn = document.createElement('button');
btn.id = 'Play-Video';
btn.type = 'button';
btn.title =  'Play/Pause Video';
btn.className ='yt-subscription-button yt-uix-button yt-uix-button-subscribe-branded';
btn.setAttribute('style', 'margin-left: 5px; outline: none; display: inline;');
btn.innerText = "Stop Video";
div.appendChild(btn);
btn.addEventListener('click',stopvidload, true);

SeekBBtn = document.createElement('button');
SeekBBtn.id = 'Seek-B-Increment';
SeekBBtn.type =  'button';
//SeekBBtn.title = 'Seek Backward';
SeekBBtn.className = 'yt-subscription-button yt-uix-button yt-uix-button-subscribe-branded';
SeekBBtn.setAttribute('style', 'margin-left: 5px; outline: none; width: 25px; display: inline;');
SeekBBtn.innerText = "◄";
div.appendChild(SeekBBtn);
SeekBBtn.addEventListener('click',seekBackward, true);

SeekFBtn = document.createElement('button');
SeekFBtn.id = 'Seek-F-Increment';
SeekFBtn.type =  'button';
//SeekBBtn.title = 'Seek Forward';
SeekFBtn.className = 'yt-subscription-button yt-uix-button yt-uix-button-subscribe-branded';
SeekFBtn.setAttribute('style', 'margin-left: 5px; outline: none; width: 25px; display: inline;');
SeekFBtn.innerText = "►";
div.appendChild(SeekFBtn);
SeekFBtn.addEventListener('click',seekForward, true);

Tbox = document.createElement('input');
Tbox.id = 'Increment-value';
Tbox.type ='number';
Tbox.setAttribute('style', 'margin-left: 5px; outline: none; width: 35px; display: inline; position: relative; top: 2px;');
Tbox.value = "5";
Tbox.min = "0";
Tbox.setAttribute('maxlength', "5");
div.appendChild(Tbox);

label = document.createElement('label');
label.id = 'Seek-Label';
label.type = 'text';
label.setAttribute('style', 'margin-left: 5px; outline: none; display: inline; position: relative; top: 2px;');
label.innerText = "Seconds";
div.appendChild(label);

CheckBox = document.createElement('input');
CheckBox.id = 'myCheckbox';
CheckBox.type = 'checkbox';
CheckBox.title =  'Show/Hide Custom Video Seeking';
CheckBox.className ='yt-subscription-button yt-uix-button yt-uix-button-subscribe-branded';
CheckBox.setAttribute('style', 'margin-left: 5px; outline: none; display: inline; position: relative; top: 2px;');
CheckBox.checked = false;
container.appendChild(CheckBox);

if (showOnPageLoad){
    CheckBox.checked = true;
    div.style.display = "inline-block";  
}else{
    CheckBox.checked = false;
    div.style.display = "none";  
}
setInterval(function(){
    
    if(CheckBox.checked == true){
        div.style.display = "inline-block";  
    }else{
        div.style.display = "none";  
    }
}, 10);

p.onpause = function(){btn.innerText = "Play Video"; toggle = true;};
p.onplay = function(){btn.innerText = "Stop Video"; toggle = false;};