iText sample

MyTest.java

public class MyClass {
	public static void main(String[] args) throws DocumentException, IOException {		
		Document document = new Document();
		document.setPageCount(1);
		
		PdfWriter.getInstance(document, 
			new FileOutputStream("/home/matrix/SimpleImages.pdf"));
		document.open();
		
		URL verdanaUrl = MyClass.class.getResource("verdana.ttf");
		
							
		BaseFont bf = BaseFont.createFont(verdanaUrl.getPath(), BaseFont.IDENTITY_H, BaseFont.EMBEDDED);	
				
		PdfPTable table = new PdfPTable(2); // Code 1
				
		// Code 2
		PdfPCell userInfo = new PdfPCell(new Paragraph("Потребител", new Font(bf, 10)));		
		userInfo.setBackgroundColor(BaseColor.GRAY);
		userInfo.setBorder(5);		
		table.addCell(userInfo);
		
		PdfPCell contractInfo = new PdfPCell(new Paragraph("Клиент",new Font(bf, 10)));		
		contractInfo.setBackgroundColor(BaseColor.GRAY);
		contractInfo.setBorder(5);		
		table.addCell(contractInfo);
				
		
		// Code 3
		table.addCell("3");
		table.addCell("4");
		
		// Code 4
		table.addCell("5");
		table.addCell("6");
		
		// Code 5
		document.add(table);			
		
		document.close();	
	}
}

hello in table I don't want bottom border and top border.how can i remove that border ?