How to Instantly Select All of Your Friends on Facebook Event Invitations

javascript:var x=document.getElementsByTagName("input");for(var i=0;i<x.length;i++) {if (x.type == 'checkbox') {x.click();}}; alert('Done, all your friends have been selected');

Copy this code when facebook asks to  select your firends...
and paste it in URL bar
 press Enter...

and VOILLA