storage.js Example File

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 var app = new Function();

 app.dbg = false;

 window.onload = function() {

     app.cred = document.querySelector('#cred');

     // open form:
     document.querySelector('#openform').addEventListener('mousedown', app.getInfo);
     // dismiss form:
     document.querySelector('#dismiss').addEventListener('mousedown', app.dismiss);

     // form validation:
     app.inputs = document.querySelectorAll('input:not([type="submit"])');
     for (var i = 0, l = app.inputs.length ; i < l ; i++ ) {
         app.inputs[i].addEventListener('blur', app.checkEdit);
     }

     // storage
     app.db_loc = window.localStorage;
     app.db_ses = window.sessionStorage;

     if (!!app.db_loc) {
         // no login info yet...
         if ( !app.db_loc.getItem('login') || !app.db_loc.getItem('password') ) app.getInfo();
     }
     else {
         alert("This application needs to run on a recent WebKit-based browser.");
     }

 };

 app.hint = function(str) {
     document.querySelector('body').className = str;
 };

 app.checkEdit = function(ev) {
     ev.currentTarget.className = 'validate';
 }

 app.getInfo = function(ev) {
     app.cred.className = 'show';
     app.inputs[0].value = app.db_loc.getItem('login');
     app.inputs[1].value = app.db_loc.getItem('password');
     app.inputs[2].value = app.db_ses.getItem('credit');
 }

 app.dismiss = function(ev) {
     app.db_loc.setItem('login', app.inputs[0].value);
     app.db_loc.setItem('password', app.inputs[1].value);
     app.db_ses.setItem('credit', app.inputs[2].value);
     ev.currentTarget.parentNode.className = 'hide';
 }