What does this mean in jQuery?

Greetings,

Check out the code included below.  While I want to gain a general understanding what it's doing (have a basic idea but want to reinforce my understanding), I especially want to know what the following construct means:

if (CreateProfile.oComments!=null)

in particular I want to under what the 'o' in '.oComments' means i.e. what its purpose is since I see this construct throughout the coding in other places.

Keep in mind my knowledge base is very minimal for this type of thing so don't be surprised if in a reply I say something that shows my ignorance of the topic, thanks.

commentsUser:function(){
        var data =
        $.ajax({
            type:"POST",
            url: DSMWSDOMAIN_URL + 'contestants/get-comments/',
            data: 'contestant_id='+Global.DSMUser[0].contestant_id+'&campaign_id=' +Global.DSMId,
            dataType: 'json',
            async: false
        });
        if (!DSM.empty(data.responseText))
        {
            CreateProfile.oComments=JSON.parse(data.responseText);;
        }
        if (CreateProfile.oComments!=null){
            var strongComment=$('#usercomment');
            strongComment.html(CreateProfile.oComments[0].display_name.substring(0,30));
            var divComment=$('#infocomment');
            divComment.html(CreateProfile.oComments[0].comment);
            if (CreateProfile.oComments.length>1){
                $('.view_more_comments').css('display','block');
                $('#totcomments').html('('+CreateProfile.oComments.length+')');
                $('.view_more_comments').click(function(){
                    tb_show(null,DSMDOMAIN_URL+'/'+Global.DSMId+'/comments.html?height=500&width=600' , false);
                });
            }
        }

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