este es mi codigo
echo "<tr>";
echo "<td style='width:100%' > ";
echo " <div class='ckbox ckbox-success' style='width:100%'> ";
echo " <input type='checkbox' onclick='validarCheck(this);' id='checkboxSuccess_";
echo $columna[1];
echo "' name='PC";
echo $columna[1]."' >";
echo "<label for='checkboxSuccess_";
echo $columna[1]."'>".$columna[0]." </label> ";
echo "</div>";
echo " </td>";
echo "<td style='width:100%' id='Tick' name='Tick' >";
echo "<div class='col-md-10'> ";
echo "<input type='text' name='Clock' size='16' >";
echo "</div>";
echo "</td>";
echo "<td style='width:100%' > cantidad</td>";
echo "<td style='width:100%' > hora final</td>";
echo "<td style='width:100%' > valor</td>";
echo "<td style='width:100%' > ";
echo " <input type='text' id='idEstado_";
echo $columna[1];
echo "' name='idEstado_";
echo $columna[1];
echo "'";
echo "value='DISPONIBLE'> ";
echo " </td>";
echo " </tr>";
y esta es mi funcion
function show() {
var Digital=new Date()
var hours=Digital.getHours()
var minutes=Digital.getMinutes()
var seconds=Digital.getSeconds()
var dn="AM"
var Clock
if (hours>12){
dn="PM"
hours=hours-12
}
if (hours==0)
hours=12
if (minutes<=9)
minutes="0"+minutes
if (seconds<=9)
seconds="0"+seconds
document.Tick.Clock.value=Digital.getFullYear()+"/"+(Digital.getMonth()+1)+"/"+ Digital.getDate() +" "+hours+":"+minutes+":"
+seconds
setTimeout("show()",1000)
}
show()
Clock == $_POST['Clock'];
ESTE ES EL ERROR
Uncaught TypeError: Cannot read property 'Clock' of undefined