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function build_next_prev() {
var url = window.location.href
var style = document.createElement('style');
style.type = 'text/css';
style.innerHTML = '.np-container {padding-left: 0;} .prev, .next {display: inline-block; margin-right: .5em;} .prev:after { content: "|"; margin-left:.5em;} .prev a:before {content: "\u00AB"; margin-right: 3px;} .next a:after{content: "\u00BB"; margin-left: 3px;}';
document.getElementsByTagName('head')[0].appendChild(style);
var cur = Number(url.split('/')[6]);
var base_url = url.split(cur)[0];
var next = cur+1;
var prev = cur-1;
var container = document.createElement("ul");
var next_li = document.createElement("li");
var next_link = document.createElement("a");
var prev_li = document.createElement("li");
var prev_link = document.createElement("a");
prev_li.className = "prev";
next_li.className = "next";
container.className = "np-container";
next_link.href = base_url + next + "/change/";
next_link.textContent = "Next";
prev_link.href = base_url + prev + "/change/";
prev_link.textContent = "Prev";
next_li.appendChild(next_link);
prev_li.appendChild(prev_link);
container.appendChild(prev_li);
container.appendChild(next_li);
console.log(container);
Array.from(document.getElementsByClassName('object-tools')).forEach(function(item) {
item.parentNode.insertBefore(container, item.nextSibling);
})
};
document.addEventListener("DOMContentLoaded", function(event) {
build_next_prev();
});
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