make a class with ajax

[firenetg]

How do i make a class with ajax? i have this code\[code\]function parseResponse(request){if (request.readyState == 4){ if (request.status == 200 || request.status == 304){ var data = http://stackoverflow.com/questions/15735799/request.responseXML; var header1Name = data.getElementsByTagName('header1') [0].firstChild.nodeValue; var text1Name = data.getElementsByTagName('text1') [0].firstChild.nodeValue; var header1Elem = document.createElement("h3"); var header1Text = document.createTextNode(header1Name); header1Elem.appendChild(header1Text); var text1Elem = document.createElement("p"); var text1Text = document.createTextNode(text1Name); text1Elem.appendChild(text1Text); var existContent = document.getElementById("information"); while ( existContent.hasChildNodes() ){ existContent.removeChild(existContent.lastChild); } existContent.appendChild(header1Elem); existContent.appendChild(text1Elem); }}\[/code\]}But i have absolutely no idea how to do a class, i want to append the class to the h3 element, any help is much appreciated,by class i mean something like \[code\]<h3 class="class">\[/code\]