<Items>
    <asp:MenuItem Text="New Authorization Form" Value="default.aspx" NavigateUrl="~/Default.aspx" ImageUrl="~/Images/TextPad.png"></asp:MenuItem>
    <asp:MenuItem Text="Manage My Forms" Value="myrequests.aspx" NavigateUrl="~/MyRequests.aspx" ImageUrl="~/Images/Pencil.png"></asp:MenuItem>
</Items>

img
{
    padding-right: 5px;
}