Check for loaded script before executing

check_for_loaded_script.js

var loaded = false;

while (loaded === false) {
  for (i in $('script')) {
    if ($('script')[i].src && $('script')[i].src.indexOf('name_of_script_here') > -1) {
      loaded = true;
      optInLiHPExperience('a');
      break;
    }
  }
}