document.write("<center>");
day = new Date();
hr = day.getHours();

if ((hr >= 1) && (hr <=4)) 
{
t = "we will show the stars what it is <br />to be a thin crescent moon.<br /><br />Welcome.";
}

if ((hr >= 5) && (hr <=7))
{
t = "Aid the dawning, tongue and pen: <br />Aid it, hopes of honest men!<br /><br />Hello and Welcome";
}

if ((hr >= 8) && (hr <=11)) 
{
t = "Good Morning, Welcome";
}

if ((hr >= 12) && (hr <=17)) 
{
t = "Good Afternoon, Welcome";
}

if ((hr >= 18) && (hr <=23)) 
{
t = "Praise day at night, <br />and life at the end.<br />Good Evening, Welcome";
}

if (hr==0) 
{
t = "Midnight is the noon of thought<br /><br />Hello and Welcome";
}

document.write(t);