code: protected void prepareAttribute(StringBuffer handlers, String name, Object value) {
  		if (value != null) {
  			handlers.append(" ");
  			handlers.append(name);
  			handlers.append("=\"");
  			handlers.append(value);
  			handlers.append("\"");
  		}
  	}
docs: Prepares an attribute if the value is not null, appending it to the the
  given StringBuffer.
  
  @param handlers
  The StringBuffer that output will be appended to.
  @param name
  the property name
  @param value
  the property value