function openWait() {
    var waitScreen = SP.UI.ModalDialog.showWaitScreenWithNoClose("Loading", "Please wait...");
    var options = SP.UI.$create_DialogOptions();
    options.url = "/Docs/AllItems.aspx";
    options.autoSize = true;
    options.allowMaximize = false;
    options.allowClose = true;
    options.args = waitScreen;

    SP.UI.ModalDialog.showModalDialog(options);
}

function closeWait(){
var waitScreen = SP.UI.ModalDialog.get_childDialog().get_args();
waitScreen.close();}
_spBodyOnLoadFunctionNames.push('closeWait');