expand acm proceedings automatically

expand.js

// take the Proceedings of the 2016 24th ACM SIGSOFT International Symposium on Foundations of Software Engineering as example
// http://dl.acm.org/citation.cfm?id=2950290&CFID=749075976&CFTOKEN=83437356
num = 152 // last index of tag need to expand
for(i = 1; i < num + 1; i++){
  try {
    expandcollapse('expcoll'+i, i)
  }
  catch (err) {
    // some index is missing, so will throw exception
  }
}