Checking A Cookie Exists Login Logoff Using Jquery / Js

I have a DNN login/logoff control which isnt working properly. I want to therefore make my own using JS/JQUERY. When the user is logged in the HTML on the page looks like this: <

Solution 1:

The demo of cookie is working just fine. Its seems you forgot to include the plugin.

See a working one here

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Update:

You can check the preexisting of a cookie like this

var preval = $.cookie('cookie-name');
if(preval != null) {
    //... 
}

Demo