function SearchAction()
{
    if(document.xinhuaform.sw.value=="")   {
       alert(" Please input keywords! ");
	   return false;
   }
    if(document.xinhuaform.st.value == "xhnet")	{	     document.location="http://big5.xinhuanet.com/gate/big5/search.xinhuanet.com/search/xhse.jsp?sw="+document.xinhuaform.sw.value;
 	     return false;
	}
	return false;
}