function NLWISMapProperties_changeUnits(){
    var cont = true;
    var szUnits = document.forms[0].measurementUnits[document.forms[0].measurementUnits.selectedIndex].value;
    if (document.forms[0].SCALE.value > 1000000 &&
        (szUnits == "METERS" || szUnits == "FEET")){
          cont = confirm(NLWISMapPropGetMssg());
    }
    
    if (cont){
        document.forms[0].NLWISMAPPROP_UNITS.value  = szUnits;
        
        if (gCWCJSAPI){
            CWCDHTML_ShowLayer("ActivityLayer");
            
            aHiddenVars = new Array(3);
            aHiddenVars[0] = new Array(2);
            aHiddenVars[0][0] =  "NLWISMAPPROP_UNITS";
            aHiddenVars[0][1] = szUnits;
            aHiddenVars[1] = new Array(2);
            aHiddenVars[1][0] =  "NLWISMAPPROP_RESET";
            aHiddenVars[1][1] = 1;
            aHiddenVars[2] = new Array(2);
            aHiddenVars[2][0] = "NAV_CMD";
            aHiddenVars[2][1] = "";
        
            szOnLoad = 'NLWISMapProperties_UnitsUpdated()';
            goCWCJSAPI.CallServer(szOnLoad, aHiddenVars);
        } else {
            document.forms[0].NLWISMAPPROP_RESET.value = 1;
            document.forms[0].NAV_CMD.value = ''; // clear NAV_CMD for function
            document.forms[0].submit();
        }
    }
    return;
}

//only used if running in JSAPI mode
function NLWISMapProperties_UnitsUpdated(){
    goCWCJSAPI.TriggerEvent(MAP_EXTENT_CHANGED);
    return true;
}