Prevent a select list from displaying certain values

<iframe width="560" height="315" src="https://www.youtube.com/embed/xyFNF3WwqmA" frameborder="0" gesture="media" allowfullscreen></iframe>

Script is called when screen is loaded. It will limit the available options in a selected list based on the user.

if(currentUser() == "jmuse") {
    lfRestrictSelectOptions("customfield_10703", {"1", "2", "3", "4", "5"});
}