function chkdata(varobj)
{
   if (varobj.name.value=="") 
   {
    alert("Please keyin your nameĦI");
    varobj.name.focus();
    return false;
   }

   if (varobj.mail.value=="") 
   {
    alert("Please keyin your E-mailĦI");
    varobj.mail.focus();
    return false;
   }
   else
   {
      if (varobj.mail.value.search("@")==-1 || varobj.mail.value.search(".")==-1 )	
      {
      	  alert("E-mail's format is Error ĦIExample:service@tp.phoenixtec.com.tw");
          varobj.mail.focus();
          return false;
      }
   }
   
   if (varobj.subject.value=="") 
   {
    alert("Please keyin the subject of messageĦI");
    varobj.subject.focus();
    return false;
   }

   if (varobj.content.value=="") 
   {
    alert("Please keyin the content of messageĦI");
    varobj.content.focus();
    return false;
   }
}