bricklink_new_and_used_inv_part_link

// ==UserScript==
// @name     Bricklink Catalog Page link to MyInventory
// @version  3
// @grant    none
// ==/UserScript==

var addToInventory = document.getElementById('_idAddToMyInvLink');

if (addToInventory) {
	var searchLink = addToInventory.href.replace('inventory_add','inventory_detail').replace('itemId=','q=');

  var newLink = "<br/><strong><a href='" + searchLink +"&invNew=N' target='_blank'>✨ MyInventory NEW</a></strong>";
  var usedLink = "<br/><br/><strong><a href='" + searchLink +"&invNew=U' target='_blank'>⚽ MyInventory USED</a></strong>";

  var currentItem = RegExp('[?&]P=([^&]*)').exec(window.location.search);
  var decoratedSearchUrl = window.location.origin + '/v2/search.page?q=' + currentItem[1] + "*";
  var decoratedLink = "<br/><br/><strong><a href='" + decoratedSearchUrl +"' target='_blank'>🖼️ search decorated</a></strong>";
  
	addToInventory.parentNode.innerHTML += newLink + usedLink + decoratedLink;
}