Auto embed a google map from it's share link

gmapembed.js

  // --------------------------------------------------------
  // auto embed google map if google map link found in body
  // Allows site content editors to simply place a standard
  // link in their text, and this will turn it into an
  // embedded map
  // --------------------------------------------------------

  // N.B. links with a class of dont-embed means... duh. dont embed.
  var sMapSel = 'a[href^="http://maps.google.co.uk/maps"]:not(.dont-embed)' ;

  $(sMapSel).each( function() {

       var nEmbedMapWidth  = 578 ;  // change dimensions to suit web page design
       var nEmbedMapHeight = 350 ;
       var sEmbedMapHref   = $(this).attr('href') ;
       // swap source=embed to output=embed
       sEmbedMapHref = sEmbedMapHref.replace('source=embed','output=embed');

       // ensure output = embed exists
       if(sEmbedMapHref.indexOf('output=embed')=== -1 ) {
         sEmbedMapHref = sEmbedMapHref + '&output=embed' ;
       }
        // Ok we have the width/height and href
        // transform this into an iFrame embed tag
        // FORMAT is
        //
        // <iframe frameborder="0" 
        //         height="350" 
        //         width="578"
        //         marginheight="0" 
        //         marginwidth="0" 
        //         scrolling="no" 
        //         src="http://maps.google.co.uk/maps?q=Address+Again&amp;output=embed"  />
        //

      if( sEmbedMapHref !='' && typeof(sEmbedMapHref)!='undefined') {
          var embedMapHtml = '<'+'ifr'+'ame ';
              embedMapHtml+= 'width="'+nEmbedMapWidth+'" height="'+nEmbedMapHeight+'" ';
              embedMapHtml+= ' src="'+sEmbedMapHref+'" ';
              embedMapHtml+= ' frameborder="0" marginheight="0" marginwidth="0" scrolling="no" ';
              embedMapHtml+= ' >'+'<'+'/'+'ifr'+'ame'+'>';

          $(this).css("display","block") ;
          $(this).parent().before(embedMapHtml); // assumes the link is in a <p> or <div>
          //$(this).hide();  //option to hide teh original link, or leave in place as a "larger version" link.
        }

    });// end each link