How to link xml page to my below source code

How to link xml page to my below source code?

can anybody tell me how to link xml file to this javascript
function loadForum(forumID)
{alert(forumID);
createForum(forumID);
// load XML
// load Data in the Container
}function createForum(forumID)
{var fCDIV = document.createElement('DIV');
fCDIV.setAttribute('id', forumID);
fCDIV.setAttribute('className', 'forumContainer');
var fTDIV = document.createElement('DIV');
fTDIV.setAttribute('id', forumID+'_Title');
fTDIV.setAttribute('className', 'forumTitle');
var fDDIV = document.createElement('DIV');
fDDIV.setAttribute('id', forumID+'_Display');
fDDIV.setAttribute('className', 'forumDisplay');
fDDIV.innerHTML = '<DIV class="forumTopics"></DIV><DIV class="forumThreads"></DIV>';
var fTBDIV = document.createElement('DIV');
fTBDIV.setAttribute('id', forumID+'_toolBar');
fTBDIV.setAttribute('className', 'forumToolBar');
fCDIV.appendChild(fTDIV);
fCDIV.appendChild(fDDIV);
fCDIV.appendChild(fTBDIV);
document.body.appendChild(fCDIV);}