Javascript SDK.JQuery.retrieveMultipleRecords issue with boolean

Hi

I have an issue with retrieving the correct boolean value from the Javascript SDK.JQuery.retrieveMultipleRecords method.  In the SuccessCallback part of the method I want to check if the value is True and do stuff according to the condition.  Just a simple example

SDK.JQuery.retrieveMultipleRecords("Contact","$select=*&$filter=ParentCustomerId/Id eq guid'" + AccountId +"'",
		function (results) {
		var firstResult = results[0];
		if (firstResult != null) 
		{
			for (var k = 0; k < results.length; k++) 
			{
				var ContactDetails = results[k];

				
				if (ContactDetails.new_myBoolean = true)
				{
				     alert('true')
				}


..........

In crm the new_myBoolean field is of type two option.  It does not matter whether the field is true all false, it always display true. 

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