Disable Case Resolution Action on form load

I am trying to disable the ability to resolve a case in CRM unless a couple fields have data. I would like to gray out the case resolution action and was wondering if anyone knew how to do this on the form Load.

Thanks!

From stackoverflow

• Try with this code on the OnLoad event of the Case form:

  var menuItem = document.getElementById('_MIresolve');
  if (menuItem)
    menuItem.disabled = 1;
  

  You can Ctrl+N any CRM page in order to be able to view its source code and figure out ids of controls.