Drupal 7 comes with jquery cookie plugin which can be find under

misc/jquery.cookie.js

This plugin can be used to check if user is logged in or not directly from Jquery. We do that by checking if the cookie DRUPAL_UID exists and its value is not equal to 0.

Usually form is submitted when the user press on a submit button. But , sometimes, you may need to submit the form programmatically using JavaScript.

JavaScript provides the form object that contains the submit() method. Use the 'id' of the form to get the form object.

For example, if the name of your form is 'myform', the JavaScript code for the submit call is:

document.forms["myform"].submit();

But, how to identify a form? Give an id attribute in the form tag: