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To access a form element with JavaScript, assign a name to the id attribute of the element you want to access.

For example, if the value of a text box needs to be accessed, set up the id attribute as follows:

input type='text' name='FirstName' id='FirstName'

Then use the JavaScript function getElementById() to access the value of the 'FirstName’'box, as follows:

var strFirstName = document.getElementById('FirstName').value;