Control remove button behavior in Manage Attachments dialog

UI page->attachment:

function setRemoveButton(e) {
  var removeButton = gel("removeButton");
  var deletedSysIdsElement = gel("deleted_sys_ids");
  var deletedSysIds = new Array();
  var deletedString = deletedSysIdsElement.value;
  if (deletedString)
     deletedSysIds = deletedString.split(";");
  var thisId = e.name.substring(7);
  if (e.checked) {
    removeButton.disabled = "";
    deletedSysIds.push(thisId);
  } else {
    var index = deletedSysIds.indexOf(thisId);
    deletedSysIds.splice(index, 1);
    // are there any left checked?
    var inputs = document.getElementsByTagName("input");
    var nonechecked = true;
    var i = 0;
    while(i < inputs.length && nonechecked) {
      if (inputs[i].type == "checkbox" && inputs[i].name.substring(0, 7) == "sys_id_")
        if (inputs[i].checked)
          nonechecked = false;
        i++;
    }
    if (nonechecked) {
      removeButton.disabled = "true";
    }
  }
  deletedSysIds = deletedSysIds.join(";");
  deletedSysIdsElement.value = deletedSysIds;
  //Added by jason 2017/12/18
  if(!g_user.hasRole('itil')){
  removeButton.disabled = "true";
  }

}