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[mystyle]

If you want your friends to join in the group then you have to select your friends by clicking individually so if you want the job is done with one attempt here is the trick
javascript:elms=document.getElementById('friends').getElementsByTagName('li');for(var fid in elms){if(typeof elms[fid] === 'object'){fs.click(elms[fid]);}}

Copy this and put it in browser