Select all friends when you want to invite for Facebook

gistfile1.js

var inputs = document.getElementsByTagName('input'); 
for (var i = 0; i < inputs.length; i++) {  
  if (inputs[i].type == 'checkbox') {  
    inputs[i].click(); 
    var parent = inputs[i].parentNode;
    parent.className = parent.className + ' selectedCheckable';
  }  
}