How to invoke my function in plugin

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Javascript

plugin

browser

In Firebreath Plugin development , after creating plugin we have to use below code to use plugin.

<object id="plugin0" type="application/x-myplugin" width="300" height="300">
    <param name="onload" value="pluginLoaded" />
</object><br />

Above code is to access our plugin , I think,
Now when I access the plugin immediately a function has to be called, how can I do that

It's like when we create an object to a class , if we have a constructor it will automatically invoked when object is created, exactly when I access the plugin by using above code I want to call a function

Thanks in advance...