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It is necessary to define the function before invoking it. Therefore it is best to reorder the inclusion of the *.js files in your page. For example:
<html> <head> <script language="JavaScript" src="test1.js"></script> <script language="JavaScript" src="test2.js"></script> </head> <body> ... </body> </html>
where test1.js contains:
function functionName() {
alert('Hello world');
}and test2.js contains:
functionName();