Defining and Calling Functions

Example 1

<HEAD> 
<SCRIPT LANGUAGE="JavaScript">
<!-- Hide script from old browsers
function square(number) {
   return number * number;
}
// End script hiding from old browsers -->
</SCRIPT>
</HEAD>
<BODY>
<SCRIPT>
   document.write("The function returned ", square(5), ".");
</SCRIPT>
<P> All done.
</BODY>

Example 2

<HEAD> 
<SCRIPT LANGUAGE="JavaScript">
<!-- Hide script from old browsers
function checkOk() {
   yn=confirm('O.K.?');
   if (yn) alert('Yes'); 
   else alert('No');
   return true;
}
// End script hiding from old browsers -->
</SCRIPT>
</HEAD>
<BODY>
...
<input type="button" value="O.K" onClick="checkOK()">
...
</BODY>