HTML5 Session Storage example of loading a blog roll every so often, not all the time

gistfile1.txt

//this function will load blog roll from sessionstorage or go get it if need be
function doLoadBlogRoll()
{
    var sessionKey = "postsInSession";
    //if browser supports session storage, try to use it
    if (sessionStorage) {
        var sessionValue = sessionStorage.getItem(sessionKey);
        if (sessionValue) {
            // update website
            $("#div_blogroll").html(sessionValue); // We just avoided one ajax request
            return true;
        }
    }
    //browser doesn't support session storage or the session var is empty, go get posts
    $.ajax({
        url: "myspecificurlgoeshere",
        type: 'GET',
        success: function (response) {
            // update website
            $("#div_blogroll").html(response);
            //if sessionStorage supported, save response in session
            if (sessionStorage) {
                sessionStorage.setItem(sessionKey, response);
            }
        },
        error: function(xhr) {
            // handle errors
            $("#div_blogroll").html("Sorry about that, but the latest posts are currently unavailable.  Please refresh this page or try again later.");
        },
    });
    return true;
}