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I'm trying to use checkbox to choose multiple data and submit(button 'Send SMS') them and direct them to another page, which will send text SMS to the numbers chosen. But when I try to click on one checkbox, it automatically directs me to the next page, without having to click on the 'Send SMS' button. I tried to see which part is the problem, but I can't determine which one is wrong. Please help! Thank you. <script type="text/javascript"> function checkedAll (frm1) {var aa= document.getElementById('frm1'); if (checked == false) { checked = true } else { checked = false }for (var i =0; i < aa.elements.length; i++){ aa.elements[i].checked = checked;} } </script> <TABLE width="1106" border="1" align="center" cellpadding="5" cellspacing="2" > <tr> <td colspan="9"> <form id ="frm1" action="sms_latecomers.php"> <input type='checkbox' name='checkall' onclick='checkedAll(frm1);' value=""> <input type="submit" name="Submit" id="button" value="SMS Reminder" style="background:#FFCC33"/> </td> </tr> <TR bgcolor="#996699"> <?php $count=0; ?> <TH width="32"></TH> <TH width="37"> <span class="style1"> <div align="center">No. </div></span></TH> <th width="101"><span class="style1">SUPERVISOR ID</span></th> <th width="101"><span class="style1">EMPLOYEE ID</span></th> <th width="153"><span class="style1">EMPLOYEE NAME</span></th> <th width="124"><span class="style1">DATE</span></th> <th width="153"><span class="style1">LATE CHECK IN</span></th> </TR> <?php while($row = mysql_fetch_array($result, MYSQL_ASSOC)) { ?> <TR> <TD><input type="checkbox" name="chk1" value="<?php echo $row['supervisor_telno']; ?>" onClick="window.open('sms_latecomers.php?employee_id=<?php echo $row['employee_id']; ?>&supervisor_telno=<?php echo $row['supervisor_telno']; ?>');"></TD> <TD height="66">[bad html removed]<input type="checkbox" name="chk1" >--> <?php $count=$count+1; print($count);?></TD> <TD><div align="center"><?php echo $row['supervisor_id']; ?></div></TD> <TD><div align="center"><?php echo $row['employee_id']; ?></div></TD> <TD><div align="center"><?php echo $row['employee_name']; ?></div></TD> <TD><div align="center"><?php echo $row['DATE']; ?></div></TD> <TD><div align="center"><?php echo $row['TIME']; ?></div></TD> </TR> <?php } ?>[bad html removed]</form>--> </TABLE>