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<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
function testLetter(form){
inpVal = form.entry.value;
if (inpVal != "") {
if (inpVal == "A") {
alert("Thanks for the A.");
} else if (inpVal == "B") {
alert("Thanks for the B.");
} else if (inpVal == "C") {
alert("Thanks for the C.");
} else {
alert("Sorry, wrong letter or case.")
}
} else {
alert("You did not enter anything.")
}
}
</SCRIPT>
</HEAD>
<BODY>
<FORM>
Please enter A, B, or C and press Enter key:
<INPUT TYPE="text" NAME="entry" onChange="testLetter(this.form)">
</FORM>
</BODY>
</HTML>
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