Send Query String Parameter while opening account entity record in CRM Online

Hello Experts, I am opening an account record on clicking of a hyperlink button in Javascript  in CRM Online Polaris version. For that i am doing like below. but i am getting error. the same thing is working for other entity but not in account. Here is my code below.

         var extRaqs="";

         extRaqs += "formId="+"9FF2B534-0731-4A94-94D3-883D4F4D951E";       
         extRaqs += "&Param=" + 1;
       window.open(serverurl + "main.aspx?etn=account&id=%7b" + acctId + "%7d&pagetype=entityrecord&extraqs=" +encodeURIComponent(extRaqs));

Please suggest where i am wrong.

Thank you

saroj