How to replace a block of HTML with another block of HTML using jQuery

var newHTML = '<div id = "banner"><div class="Logo"></div>' +
              '<img src="http://www.abc.com/home/images/spacer.gif" ' + 
              'height="35" width="180"  border="0" alt=""> <font ' + 
              'class="bannertext">&APPNAME.</font><div class="bannerText">' + 
              '<div class="hmenu"><ul>&APPLICATION_LINKS.</ul>' + 
              '</div></div>';
$('table.t12PageBody').replaceWith(newHTML);