how to access the textboxe array through javascript

Hi All,
i am new to this forum,
My Question is how can i access the textboxes array through javascript for form validation
i am mentioning the example code so that you all can better understand

<form name=”xyz” onSubmit=”return Validate(this)” method=”any”>
<input type=”text” name=”agentname[]” />
<input type=”text” name=”agentname[]” />
<input type=”text” name=”agentname[]” />
<input type=”text” name=”agentname[]” />

<!– Other Form Controls –>

<input type=”submit” />

</form>

now i have to access all the textboxes to validate their data ..
i hope you can understand my problem
Thanks

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