javascript to retain form on login failure -

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below javascript function authenticate user... wanna retain form on login failure username/password textbox being blank. 

           function authenticate(form)       {           if (form.username.value == "administrator" && form.password.value == "password")           {              window.open('orderlist.aspx')/*opens target page while id & password matches*/          }          else           {              alert("error password or username")              $("#username").val("")              $("#password").val("")              form.????????????('login.aspx')//so stays on same page wihout reloading page.  tried window.open, opens instance of form.              /*displays error message*/          }      }

i assume firing either onclick or onsubmit. preventing form submission, want use onsubmit , have return results of function. in case of validation failure, javascript function needs return false; prevent form being submitted.

when validation passes, can either return true; or nothing (assuming want form continue being submitted...if want issue call window.open(), should return false; in both cases.

for more detailed explanation, see this answer similar question.

as removing values text fields, have (e.g. below code) work - reason aren't seeing impact page reloading due form being submitted.

$("#username").val(""); $("#password").val("");

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