$sql="select * from contratos";
$registros = mysql_query($sql);
$c=1;
$cantreg=mysql_num_rows($registros);
while($row2=mysql_fetch_array($registros))
{
$arregcedula[$c-1]=$row2["cedula"];
$nom="chk".$c;
echo "<tr><td><input type='checkbox' name='$nom' value=1></td>";
echo "<td>"; echo $row2["cedula"];
echo "</td>";
echo "<td>"; echo $row2["nombre"];
echo "</td>";
echo "<td>"; echo $row2["cargo"];
echo "</td>";
echo "<td>"; echo $row2["contrato"];
echo "</td>";
echo "<td>"; echo $row2["email"];
echo "</td>";
echo "<td>"; if ($row2['visible']=='1') echo"<img src='check.png' width='25' height='20'/>";
elseif ($row2['visible']=='0'){echo"<img src='nocheck.png' width='25' height='20'/>";}//echo $row2["visible"];
echo "</td>";
echo "<td>"; if ($row2['activo']=='1') echo"<img src='check.png' width='25' height='20'/>";
elseif ($row2['activo']=='0'){echo"<img src='nocheck.png' width='25' height='20'/>";}//echo $row2["activo"];
echo"</td></tr>";
$c++;