/*plugin*/ var chain = client.Initialise; client.Initialise = function() { var ok = 1; if( /* not already installed */ ) { if( /* we are missing a dependency */ ) { XMLRequest( /* dependency's URL */ ) ok = 0; } else { /* install ourselves */ } } if( ok ) // either we installed successfully or we were already installed { client.Initialise = chain; chain = null; if( client.Initialise ) { client.Initialise(); } } } client.Initialise();