Function PDF - landscape orientation

Function PDF - landscape orientation

Hi,
I have a function script as

{
    openUrl((((("/" + zoho.adminuser) + "/") + zoho.appname) + "/pdf/Print1/recId=") + input.id + , "same window" );
}

I can't add ZC parameter as

&zc_PdfOrientation=landscape

Any help?
Thanks

Mic