$(document).ready(function() {
    $("#idHomePageNewItem").attr("href", ".../_layouts/15/start.aspx#/Lists/Sandbox/NewForm.aspx?Source=.../Lists/Sandbox/AllItems.aspx&ContentTypeId=0x01080013D954563B0D1441BC90FAEC292D8798&RootFolder=/Lists/Sandbox");
    $("#idHomePageNewItem").attr("onclick", "");
});

Sys.Application.add_load(function(){
    //TODO: rebind your jquery here
});