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Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in C:\AppServ\www\rung1\quiz.php on line 41

			 $lms_quizSQL = "select * from lms_quiz where qz_chid='$ch_id' and qz_status=0 order by rand(qz_no)";
			 $lms_quizQUERY = mysql_db_query($dbname, $lms_quizSQL);
			 $quizNUM = mysql_num_rows($lms_quizQUERY);
			 	$qzs=0;
				while($qzs<$quizNUM)
				{
					 $lms_quizRS = mysql_fetch_array($lms_quizQUERY);