Hi Sherry.
In your transformation you can add the two fields using data attributes like...
<span id="newlikes" data-currentuser="<%# BlogFunctions.GetUserName(Eval("CurrentUser")) %>" data-blogposttitle="<%# Eval("BlogPostTitle")%>">Like</span>
Then in jQuery you can reference them...
$("#newlikes").click(function() {
alert( "User : " + $(this).data("currentuser") + "\nTitle : " + $(this).data("blogposttitle") );
});