javascript - Jquery - Calling 3rd tag -

i need activate third party tag on website when webpage show message "choisissez la finition"

the div show message

<div id="vw_dbs_ihdcc_trimselector" class="container containercolquarter"><h2>choisissez la finition</h2>

i've tried

function (session, cb){window.addeventlistener("hashchange", function() {     if(document.location.hash.indexof("carimage") > -1)     {         var len2 = jquery("h2:contains('choisissez la finition')").length;             if (len2 > 0)             {                 cb();             }         }     }); } 

any advice, ?

many thanks,

what need following.

function dosomething(session, cb){      if(location.hash.indexof("carimage") > -1) {         var len = $("h2:contains('choisissez la finition')").length;         if (len) {             cb();         }     } });  //define callback function function mycb() {     alert ("i callback function");    }  //bing event on hashchange using jquery anyway have it. $(window).on("hashchange", function() {     //call function params     dosomething("yoursession", mycb); });