NS_IF_RELEASE(mContent);
OnLinkClickEvent::~OnLinkClickEvent(){  NS_IF_RELEASE(mContent);  NS_IF_RELEASE(mHandler);  NS_IF_RELEASE(mPostDataStream);  NS_IF_RELEASE(mHeadersDataStream);  if (nsnull != mURLSpec) delete mURLSpec;  if (nsnull != mTargetSpec) delete mTargetSpec;}