Pass parameters to form in JScript

Am trying to set default values for fields on the form but get an error. Any clues on what I'm doing wrong?

The script is on click of a ribbon button on Account form

 function addDetails()
    {

        var windowoptions = {
            openInNewWindow: true
        };
        var parameters = {};
        
        // Set Customer lookup on the Child entity form with data from the Account form. 
    
        parameters["new_customerid"] = Xrm.Page.data.entity.getId();
        parameters["new_customeridname"] = Xrm.Page.getAttribute("name").getValue();
         parameters["new_customeridtype"] = "account";
        
            Xrm.Utility.openEntityForm("new_details", null, parameters, windowoptions);
         
        
    }