how to populate dropdown selected value using javascript

$(options).each(function(k, v) {
  $("#Payment").append(new Option(v));
});

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		function updatebiller()
		{
			var obj = document.obpresentform;
			var billervalue = b.getElementsByTagName("biller");
			//values i am getting from db thru xml framework,inthis step values are coming but i am unable to get it from the var billervalue
			alert('hello billervalue '+billervalue);  // o/p of this alert : [object html collection]			
			billervaluelen = billervalue.length;	//o/p:3		
			var bilcatarray = billervalue.split(",");//o/p: billervalue.split is not a function
			alert(obj.payment.options[obj.payment.selectedIndex].text);//o/p: i am getting selected value as debitcard
						
			var payment = obj.payment.options[obj.payment.selectedIndex].text;			
			
			for (i = 0; i < billervaluelen; i++) 
			{
			  var option = document.createElement("option");
			  option.text = bilcatarray[i];
			  alert('vals '+bilcatarray[i]);
			  payment.add(option);
			  payment.add(option, payment[0]);
			}
		}					
			

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b.getElementsByTagName("biller");

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alert('hello billervalue '+billervalue);

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console.log(billervalue)

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