Injecting javascript and css to Sitecore Content Editor Page

Sometimes we need to use javascript in our custom fields, to do that we should inject them into Content Editor Page: 

    public class InjectScripts
    {
        public void Process(PipelineArgs args)
        {
            if (Sitecore.Context.ClientPage.IsEvent) return;

            HttpContext current = HttpContext.Current;
            if (current == null) return;

            Page page = current.Handler as Page;
            if (page == null) return;

            string[] strArray = {
               "/sitecore/shell/Controls/Lib/Scriptaculous/Scriptaculous.js",
               "/sitecore/shell/Controls/Lib/Scriptaculous/builder.js",
               "/sitecore/shell/Controls/Lib/Scriptaculous/effects.js",
               "/sitecore/shell/Controls/Lib/Scriptaculous/dragdrop.js",
               "/sitecore/shell/Controls/Lib/Scriptaculous/slider.js",
               "/sitecore/shell/Controls/CustomControls/CustomField/custom.js"
                                };
            foreach (string str in strArray) page.Header.Controls.Add(new LiteralControl(string.Format("", str)));
            
            page.Header.Controls.Add(new LiteralControl(""));
        }
    }

And in config file:

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <pipelines>
      <rendercontenteditor>
        <processor patch:before="*[1]" type="CustomField.InjectScripts, CustomField">
      </processor>
     </rendercontenteditor>
    </pipelines>
  </sitecore>
</configuration>

Very Easy!