Consider the following HTML.

1. <input type="text" id="txtEmail" name="Email"  />
2. <input type="text" id="txtConfirmEmail" name="ConfirmEmail" /> 

The following script is used to Compare two fields with jQuery validate plugin.

1. $('#myform').validate({
2.     rules: {
3.         Email: { required: true },
4.         ConfirmEmail: { equalTo: '#txtEmail' }
5.     }
6. });