<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.

People who read this tip also read these tips:

• Hiding the Script
• Using External Scripts
• Avoiding VBScript on the Mac
• Combining JavaScript and VBScript
• Server-Side Includes