<SCRIPT LANGUAGE="JavaScript1.3">
<!--
 function handleClick() {
   alert("This browser supports JavaScript 1.3 and up");
}
document.write('<FORM NAME="jukebox">Hit the button:<INPUT TYPE="button" ID="display" VALUE="Demo 1.3" onclick="handleClick()">');
// -->
</SCRIPT>

You should see a Demo button here:

If you don't see the button, your browser does not support JavaScript 1.3. The following code will be exercised only when JavaScript 1.4 comes along:

<SCRIPT LANGUAGE="JavaScript1.4">
<!--
 function handleClick() {
   alert("This browser supports JavaScript 1.4 and up");
}
document.write('<FORM NAME="jukebox">Hit the button:<INPUT TYPE="button" ID="display" VALUE="Demo 1.4" onclick="handleClick()">');
// -->
</SCRIPT>

You should see a Demo button here when JavaScript 1.4 is out:

Many features have been introduced in JavaScript 1.3. Learn more about them in Column 25, JavaScript 1.3 Overview, Part I, and Column 26, JavaScript 1.3 Overview, Part II.

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