Javascript to show html paje in shadow box Once

Question

You can set a cookie when shadow box is displayed

Here is fiddle i have worked on http://jsfiddle.net/gd7Xz/ Working Fiddle of your Code http://jsfiddle.net/G3XAb/

Hope this Helps you, Please tick the Answer

    <!DOCTYPE html>
<html>

    <head>
        <style>
            #ShadowBox {
                width: 100px;
                height: 100px;
                display: block;
                background-color: blue;
                display:none;
            }
        </style>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
        <script>
            //function for settinf the cookie
            function setCookie(cname, cvalue, exdays) {
                var d = new Date();
                d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
                var expires = "expires=" + d.toGMTString();
                document.cookie = cname + "=" + cvalue + "; " + expires;
            }

            //function for reading cookie
            function getCookie(cname) {
                var name = cname + "=";
                var ca = document.cookie.split(';');
                for (var i = 0; i < ca.length; i++) {
                    var c = ca[i].trim();
                    if (c.indexOf(name) == 0) return c.substring(name.length, c.length);
                }
                return "";
            }
            //For Setting the Cookie, you can call this onload or at the displaying of the shadowbox.
            function MarkVisited() {
                setCookie("visited", "visited", 10)
            }

            function ClearCookie(cname) {
                setCookie(cname, "", 1)
            }


            //Put this in the document ready section. so it runs at onload
            $(document).ready(function() {
                if (getCookie('visited') == "") {
                    $('#ShadowBox').show();
                }
                MarkVisited();
            });
            // On Load Section End
        </script>
    </head>

    <body>
        <div id="ShadowBox"></div>
        <button id="ClearCookie" onClick="ClearCookie('visited')">Clear Cookie</button>
    </body>

</html>