Microsoft CRM 2011, hide system Save menu

Recently we were asked if it is possible to disable a standard 'Save' menu of Microsoft CRM 2011, since all data on forms is read-only anyway. So, after some searching I've found sample code how to do this. The key was to use "top" property which is containing parent frame which is necessary, since our code (called in "OnLoad" form event) is executing in inner frame. With some modifications this is what finally worked out for me:

var disableSaveMenu = function() {
    // your entities names
    var entities = ["account", "contact" /* add as necessary */];

    var i;
    for(i = 0; i < entities.length; i++) {
        var ent = entities[i];
        var save = top.document.getElementById(ent + "|NoRelationship|Form|Mscrm.Form." + ent + ".MainTab.Save");
        if(save != null) {
            save.style.display = 'none';
            break;
        }
    }
    
    // hide 'File' menu, additional 'Save' is also located there
    var jewel = top.document.getElementById("jewelcontainer");
    if(jewel != null) {
        jewel.style.display = 'none';
    }
};