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Q411 How do I stop old versions of netscape (pre 3) and Internet Explorer (pre 4) from giving errors due to them not seeing *.js files which define functions used later in the page?

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Set a variable in the *.js file to true:

<script language="JavaScript"><!--
var loaded = false;

<script src="library.js"></script>

And then in library.js:

loaded = true;

And then you can check this before invoking any functions stored in library.js:

if (loaded) function_name();

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