var REQUIRED_username="Please enter username";var VALID_user_name="Please enter only alphabets, numbers, underscore( _ ), dot(.) in user name.";var REQUIRED_password="Please enter password";function login_validate(form){var errormessages="";var fldnames="";clearErr(form.elements.length,form.elements);with(form){if(isEmpty(elements["username_E"].value)){errormessages+=REQUIRED_username+"<br>";fldnames+=",username_E"}if(isEmpty(elements["password_E"].value)){errormessages+=REQUIRED_password+"<br>";fldnames+=",password_E"}if(errormessages!=""){showError(fldnames,errormessages);return false}else{return true}}return true}