[NTG-context] special characters in URLs

I need to establish links to URLs that include the ampersand (&) and number sign (#). e.g., http://www.mhs.ox.ac.uk/collections/imu-search-page/record-details/?TitInventoryNo=40829&querytype=field&thumbnails=on&irn=2020 and http://www.davidaking.org/instrument-catalogue-TOC.htm#part6 How does one do this? The best I have done thus far is to get broken links that display as they should. Alan