Pass parameter of lookup in openEntityForm using javascript

For simple lookup :

function OpenNewContact() {

 var parameters = {};

 parameters["new_accountid"] = "2878282E-94D6-E111-9B1D-00155D9D700B";

 parameters["new_accountname"] = "Contoso";

 // Open the window.

 Xrm.Utility.openEntityForm("contact", null, parameters);

}

For Customer or owner Lookup

function OpenNewContact() {

 var parameters = {};

 parameters["parentcustomerid"] = "2878282E-94D6-E111-9B1D-00155D9D700B";

 parameters["parentcustomeridname"] = "Contoso";

 // Open the window.

 Xrm.Utility.openEntityForm("contact", null, parameters);

}

Party List Parameter : We cannot pass parameters to Party list.