function getName() {
     var inputname = prompt("Please Enter your name: ", "Frank");

     document.LittleForm.yourname.value = "Hi "+ inputname +"!!";

     document.write('<H2><CENTER><FONT COLOR="navy">');
     document.write(inputname + ", try a variation of this page for yourself.");
     document.write("</FONT></CENTER></H2>");
}

</SCRIPT>

<FORM NAME="LittleForm">
     <INPUT TYPE="text" NAME="yourname">
     <INPUT TYPE="button" VALUE="Get Name" onClick="getName()">
</FORM>