How to retrieve optionset value from other entity using CRMRestKit?

Hi,

I am using CRMRestKit solution to make crossentity operations with jscript easier for me. I am able to retrive value of string fields from other entity based on its guid (which I get from current form of incident entity), but I can't get value of an option set from other entity. My code is:

function SetContactPreferences()
{
if (Xrm.Page.getAttribute('customerid').getValue() != null)
{
CrmRestKit.Retrieve('Account', Xrm.Page.getAttribute('customerid').getValue()[0].id, ['new_optionset1']).fail(window.globalFail).done(function (data) {

alert(Xrm.Page.getAttribute('data.d.new_optionset1').getValue());

});
}
}

Xrm.Page.getAttribute(data.d.new_optionset1).getValue());

I get an error that the Object does not provide 'getValue' property or method. Is there  a way to get the value of optionset using CRMRestKit? I couldn't find the sample of retrieving data from this type of fields. I would be grateful for your help.