What you need to add to your layout to use nerdergFormTags

gistfile1.xml

  <g:javascript plugin="jquery" library="jquery" />
  <g:javascript src="jquery.mousewheel.min.js" />
  <g:javascript src="jquery.timeentry.min.js" />
  <jqui:resources theme="smoothness" />
  <g:javascript plugin="nerderg-form-tags" src="nerdergFormTags.js" />
  <g:javascript>
    nerdergFormTags.dateImg = "${resource(plugin: 'nerderg-form-tags', dir: 'images/icons', file: 'date.png')}";
    nerdergFormTags.dateFormat = "dd/mm/yy";
  </g:javascript>
  <link rel="stylesheet" href="${resource(dir:'css',file: 'main.css')}" />
  <link rel="stylesheet" href="${resource(dir:'css',file: 'jquery.timeentry.css')}" />
  <link rel="stylesheet" href="${resource(plugin: 'nerderg-form-tags', dir:'css',file: 'nerdergFormTags.css')}" />