formulier in PHP

<?php
function poll($poll)
{
	if(isset($poll))
	{
		if($_REQUEST['submit'])
		{
			$sql = "SELECT * FROM poll WHERE id=".$poll."";
			$query = mysql_query($sql) or die(mysql_error());
			$result = mysql_fetch_array($query) or die(mysql_error());
			
			if($_POST['ant1'] == true)
			{
				$ant1 = $result['ant1'];
				$total = $result['totaal'];
				$total++;
				$ant1++;
				$sql = "UPDATE poll SET ant1=".$ant1.",totaal=".$total." WHERE id=".$result['id']."";
				mysql_query($sql) or die(mysql_error());
			}
			elseif($_POST['ant2'] == true)
			{
				$ant2 = $result['ant2'];
				$ant2++;
				$total = $result['totaal'];
				$total++;
				$sql = "UPDATE poll SET ant2=".$ant2.",totaal=".$total." WHERE id=".$result['id']."";
				mysql_query($sql) or die(mysql_error());
			}
			elseif($_POST['ant3'] == true)
			{
				$ant3 = $result['ant3'];
				$ant3++;
				$total = $result['totaal'];
				$total++;
				$sql = "UPDATE poll SET ant3=".$ant3.",totaal=".$total." WHERE id=".$result['id']."";
				mysql_query($sql) or die(mysql_error());
			}
			elseif($_POST['ant4'] == true)
			{
				$ant4 = $result['ant4'];
				$ant4++;
				$total = $result['totaal'];
				$total++;
				$sql = "UPDATE poll SET ant4=".$ant4.",totaal=".$total." WHERE id=".$result['id']."";
				mysql_query($sql) or die(mysql_error());
			}
			else
			{
				echo"error u moet wel iets invullen";
			}
			$sql = "SELECT * FROM poll WHERE id=".$poll."";
			$query = mysql_query($sql) or die(mysql_error());
			$result = mysql_fetch_array($query) or die(mysql_error());
			
			$p1 = ($result['ant1'] * 100) / $result['totaal'];
			$p1 = round($p1,2);
			$p2 = ($result['ant2'] * 100) / $result['totaal'];
			$p2 = round($p2,2);
			$p3 = ($result['ant3'] * 100) / $result['totaal'];
			$p3 = round($p3,2);
			$p4 = ($result['ant4'] * 100) / $result['totaal'];
			$p4 = round($p4,2);
			
			echo "<table>
				  <tr>
				  <td colspan='2'>".$result['vraag']."</td>
				  </tr>
				  <tr>
				  <td>".$result['optie1']."</td><td>".$result['ant1']." stemmen $p1%</td>
				  </tr>
				  <tr>
				 <td>".$result['optie2']."</td><td>".$result['ant2']." stemmen $p2%</td>
				  </tr>
				  <tr>
				  <td>".$result['optie3']."</td><td>".$result['ant3']." stemmen $p2%</td>
				  </tr>
				  <tr>
				  <td>".$result['optie4']."</td><td>".$result['ant4']." stemmen $p4%</td>
				  </tr>
				  <tr>
				  <td colspan='2'>Er is totaal ".$result['totaal']." keer gestemd</td>
				  </tr>
				  </table>";
		}
		else
		{
			$sql = "SELECT * FROM poll WHERE id=".$poll."";
			$query = mysql_query($sql) or die(mysql_error());
			$result = mysql_fetch_array($query) or die(mysql_error());
	
				if ($result['zichtbaar'] == 1)
				{
					echo "<ul id=\"menu\"><li><h2>Poll</h2></li>";
					echo "<li>Vraag:".$result['vraag']."</li>";
					echo "<li>".$result['datum']."</li>";
					echo "<form method='post' action='?pagina=polls&id=$poll'>";
					if($result['optie1'] != "")
					{
						echo "<input type='radio' name='ant1'/>".$result['optie1']."<br/>";
					}
					if($result['optie2'] != "")
					{
						echo "<input type='radio' name='ant2'/>".$result['optie2']."<br/>";
					}
					if($result['optie3'] != "")
					{
						echo "<input type='radio' name='ant3'/>".$result['optie3']."<br/>";
					}
					if($result['optie4'] != "")
					{
						echo "<input type='radio' name='ant4'/>".$result['optie4']."<br/>";
					}
					echo "<input type='submit' value='stem' /><br/></form>";
					echo "<li><a href=\"?pagina=polls\">ga terug naar het overzicht</a></li>";
					echo "</ul>";
				}
		}
	}
	else
	{
			echo "<h2 class='content'>Polls</h2>
				  <table class='content'>";
			
			$sql = "SELECT * FROM poll ORDER BY id DESC";
			$query = mysql_query($sql) or die(mysql_error());
			
			while($result = mysql_fetch_array($query) or die(mysql_error()))
			{
				if ($result['zichtbaar'] == 1)
				{
					echo"<tr class='updateTitle'>
						 <td>".$result['vraag']."</td><td>".$result['datum']."</td>
						 </tr>
						 <tr>
						 <td><form>
							 <input type='button' value='bekijken' onclick=\"goTo('?pagina=polls&id=".$result['id']."')\" />
							 </from>
						 </td>
						 </tr>";
				}
			}
	}
}
?>