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Thanks everyone for the response.
<@U29QCJQF3> <@U7A0KGURX> 
But I want to use only User Event here. (SS1.0)
So I tried the following code: I redirect the URL on click of VOID button.

var parameter = []; // empty array
		// add elements with string keys
		parameter['gbtvoid'] = 'T';
				
		// Add custom button 'Void' on Customer Refund
		form.addButton('custpage_voidcr', 'Void CR',nlapiSetRedirectURL('RECORD', nlapiGetRecordType(), nlapiGetRecordId(),false,parameter));

This is giving me error. The URL is generating correctly with the following error:
<http://system.sandbox.netsuite.com|system.sandbox.netsuite.com> redirected you too many times.