This javascript cut & paste code snippet will ask for the viewers name and display it directly on to the page. Also has an automated message for those just hitting cancel.  

Insert this code into your HEAD of HTML

<!-- // == This Script Free To Use Providing This Notice Remains == // // == This Script Has Been In The http://www.DesignerWiz.com Javascript Public Archive Library == // // == NOTICE: Though This Material May Have Been In A Public Depository, Certain Author Copyright Restrictions May Apply == // --><SCRIPT LANGUAGE = "JavaScript"> <!-- Original: Mattias Sjoberg <!-- Begin var username = GetCookie('username'); if (username == null) { username = prompt('Please enter your name (otherwise press cancel)',"Web Surfer"); if (username == null) { alert('Its ok if you dont want to tell us your name'); username = 'WebSurfer'; } else { pathname = location.pathname; myDomain = pathname.substring(0,pathname.lastIndexOf('/')) +'/'; var largeExpDate = new Date (); largeExpDate.setTime(largeExpDate.getTime() + (365 * 24 * 3600 * 1000)); SetCookie('username',username,largeExpDate,myDomain); } } function getCookieVal (offset) { var endstr = document.cookie.indexOf (";", offset); if (endstr == -1) endstr = document.cookie.length; return unescape(document.cookie.substring(offset, endstr)); } function GetCookie (name) { var arg = name + "="; var alen = arg.length; var clen = document.cookie.length; var i = 0; while (i < clen) { var j = i + alen; if (document.cookie.substring(i, j) == arg) return getCookieVal (j); i = document.cookie.indexOf(" ", i) + 1; if (i == 0) break; } return null; } function SetCookie (name, value) { var argv = SetCookie.arguments; var argc = SetCookie.arguments.length; var expires = (argc > 2) ? argv[2] : null; var path = (argc > 3) ? argv[3] : null; var domain = (argc > 4) ? argv[4] : null; var secure = (argc > 5) ? argv[5] : false; document.cookie = name + "=" + escape (value) + ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + ((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : ""); } // End --> </script>

Insert this code into your BODY of HTML

<SCRIPT> <!-- Begin document.write('<font size="+3">Hello '+username+'!</font>'); if (username == "Web Surfer") { document.write('</font><br><small><a href="http://designerwiz.com" target="_top">Get Your Free Greeting</A></small>') } // End --> </script>

Simply Cut and Paste Script code
Be sure to properly place script position in HEAD & BODY of html 

This script has been in the DesignerWiz.com Public Library.