embed jquery in your document.
also, code in an empty div in your markup, with the id "only-if-url"
var pathname = window.location.pathname;
//do a regex search here for strings starting with (www.tld.com/pris/*anythinghere*)
//or all of its cousins including those that have http:// before, the ones without www
//etc., if it matches, then do the following
$("#only-if-url").html("your dynamic stuff here");