var d=new Date();
theDay=d.getDay();
var h=d.getHours();

document.write("<br />");

document.write("<h3 style='color:#060;text-align:center'>");
if (h<12 && h<18)
document.write("Good Morning! <br />");
else if (h>12 && h<18)
document.write("Good Afternoon! <br />");
else
document.write("Good Evening! <br />");
document.write("</h3>");

document.write("<br />");