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<head>
<title> If Demo Page </title>
<script type="text/javascript">
function ShowMessage()
// Assumes: document.IfForm.gradeBox contains a grade
// Results: displays a warning in response to a failing grade
{
var grade;
grade = document.IfForm.gradeBox.value;
grade = parseFloat(grade);
if (grade < 60) {
alert("You failed! Time to hit the books.");
}
}
</script>
</head>
<body>
<form name="IfForm">
Your grade: <input type="text" name="gradeBox" size=10 value="" />
<br /><br />
<input type="button" value="Click for Message" onClick="ShowMessage();" />
</form>
</body>
</html>
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