function check_u_p(){

   if(document.login_user.username.value.length < 3 ){
      alert("Please type your Username.");
      document.login_user.username.value = "";
      document.login_user.username.focus();
      return false;
      }

   if(document.login_user.password.value.length < 2){
      alert("Please type your Password.");
      document.login_user.password.value = "";
      document.login_user.password.focus();
      return false;
      }

   return true;

   }