Add file manager code

Hi
I am trying to add a filemanger to my project,

can someone tell me where is need to add the code

$(‘.iframe-btn’).fancybox({
‘width’ : 900,
‘height’ : 600,
‘type’ : ‘iframe’,
‘autoScale’ : false
});

menu item
Open Filemanager

thanks

To add external scripts, see the topic Tools → Scripts and Stylesheets in the help file.
Then you can use your plugin in Startup Script, see the topic Server Events and Client Scripts in the help file.