validation

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http://www.smashingmagazine.com/2009/07/07/web-form-validation-best-practices-and-tutorials/ Ideally, users will fill the web form with necessary information and finish their job successfully.

Web Form Validation: Best Practices and Tutorials | How-To

Using Ajax to Validate Forms

There’s two types of validation: http://jqueryfordesigners.com/using-ajax-to-validate-forms/