I'm developing win8(metro style) application with Html5-js-jquery. I have this code segment;

    GetBoutiqueDetail: function (boutiqueId, options) {
        if (IsUserLogin()) {
            //different job A
        } else {
            ShowLoginPanel(undefined);
        }
    },
    GetProductDetail: function (boutiqueId, productId, options) {
        if (IsUserLogin()) {
            //different job B
        } else {
            ShowLoginPanel(undefined);
        }
    },
    AddBasket: function (productId, productVariantId, quantity, options) {
        if (IsUserLogin()) {
            //different job C
        } else {
            ShowLoginPanel(undefined);
        }
    },....

.And ~20 functions should check if user login or not. I should call functions like similar to "Library.GetBoutiqueDetail();"

So my question is simple, how can I refactor that code to remove these if-else sections ?