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copied!<p>DEMO: <a href="http://jsfiddle.net/abc123/JYsdN/1/" rel="nofollow noreferrer">http://jsfiddle.net/abc123/JYsdN/1/</a></p> <p>Edit: added comments</p> <p>JS:</p> <pre><code> //Gets the cookie with given c_name taken from w3school function getCookie(c_name) { var c_value = document.cookie; var c_start = c_value.indexOf(" " + c_name + "="); if (c_start == -1) { c_start = c_value.indexOf(c_name + "="); } if (c_start == -1) { c_value = null; } else { c_start = c_value.indexOf("=", c_start) + 1; var c_end = c_value.indexOf(";", c_start); if (c_end == -1) { c_end = c_value.length; } c_value = unescape(c_value.substring(c_start, c_end)); } return c_value; } //Sets the cookie with given c_name to given value for exdays taken from w3school function setCookie(c_name, value, exdays) { var exdate = new Date(); exdate.setDate(exdate.getDate() + exdays); var c_value = escape(value) + ((exdays == null) ? "" : "; expires=" + exdate.toUTCString()); document.cookie = c_name + "=" + c_value; } //Function for GUID creation function s4() { return Math.floor((1 + Math.random()) * 0x10000) .toString(16) .substring(1); }; //Function for GUID creation function guid() { return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4(); } //Checks if the user has the cookie function checkCookie() { //attempts to get the cookie var user = getCookie("user"); //If the user doesn't have a cookie if (user == null || user == "") { //Welcome them alert("Welcome!!!"); //Create a GUID user = guid(); //Set the user's cookie to their GUID expiring in 365 days if (user != null && user != "") { setCookie("user", user, 365); } } } //on document.ready call checkCookie checkCookie(); </code></pre>

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