Someone

// Delete quiz and related details

if (isset($_POST['delquiz']))
{
	echo "test1";
	if ( count($delquiz) !=0 ) 
	{   
	     echo "test2";
             echo "you have succesfully deleted:<br>";
	     foreach ( $delquiz as $quizid )
             { 				  
		   $result2 = mysql_query("SELECT * FROM `questiontable` WHERE `quizid` = '$quizid'");
		   if (!mysql_num_rows($result2) == 0)
	           {
			 while($row = mysql_fetch_array($result2))	
			 {
			       $questionid = $row['questionid'];
			       echo "test3";
			       $result3 = mysql_query("DELETE FROM answertable WHERE questionid = '$questionid'");
		         }
		   }
	           $result = mysql_query("DELETE FROM questiontable WHERE quizid='$quizid'")		
		   or die(mysql_error());  
	     }
	     $result = mysql_query("DELETE FROM quiztable WHERE course='$course'")
	     or die(mysql_error());  
       }
       else echo "You have not selected any quizzes to delete.";

}


// Delete quizzes	

	$res = mysql_query("SELECT * FROM `quiztable` WHERE `course` = '$course'");
	if (!mysql_num_rows($res) == 0)
	{
		echo "<br>Here are the quizes supplied for this course:<br>";
		echo "<table border='1'>
		<tr>
		<th>Quiz</th>
		<th>Delete?</th>
		</tr>";
		echo "<form name='delquiz' method='post' action='teacher.php?course=" . $course . "'>";
		$i=1;
		while($row = mysql_fetch_array($res))
		{
			echo "<tr>";
		   	echo "<td>" . $row['title'] . "</td>";
		  	echo "<td> <input type='checkbox' value='" . $row['quizid'] . "' name='delquiz[$i]'> </td>";
		        echo "</tr>";
			$i++;
  	 	}
		echo "</table>";
      		echo "<input type='submit' name='submit' value='Delete'>";
      		echo "</form><br><br>";
	}
	else echo "<br>There are currently no quizes supplied for this course.<br>";