AbhijeetM
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<html> <head> <title>Port Scanner for Mozilla Firefox</title> </head> <body> <form name="my_form" id="my_form" method="post" action="#" onsubmit="return displayMessage();"> <p align="center">URL/Domain Name/IP Address: <input type="text" size="20" name="uri" value="" placeholder="http://www.google.com" required/></p> <table align="center" border="1" width=100% bgcolor="#f4fff0" bordercolor="green" cellspacing="2" cellpadding="2"> <tr> <td align="center"> Start port: <input type="text" size="5" name="start_port" maxlength="5"> End port: <input type="text" size="5" name="end_port" maxlength="5"><br> <input type="submit" value="Scan all ports" name="scan_all"><br> <input type="submit" value="Scan only open ports" name="scan_open"> </td> </tr> <tr> <td align="center"> <input type="text" size="20" name="scan_tcp"><br> <font color="#b1b1b1">Enter port numbers separated by space. (e.g. 21 25 80)</font><br> <input type="submit" value="Scan TCP ports" name="scan_tcp_ports"> </td> </tr> <tr> <td align="center"> <input type="submit" value="Scan common service ports" name="scan_common_tcp"><br> <input type="submit" value="Scan common Trojan ports" name="scan_common_trojan_tcp"> </td> </tr> </table> </form> <script type="text/javascript"> function displayMessage() { if(document.my_form.uri.value==0) { document.write("<font color='red'><i>Please enter URL/Domain Name/IP Address.</i></font>"); return false; } document.write("<DIV id='loading'><BR><BR><font color='#FF6600'><i>Please wait... The ports are being scanned...</i></font></DIV>"); document.getElementById("my_form").submit(); } window.onload=function() { document.getElementById("loading").style.display="none"; } </script> </body> </html> I want to submit above form. But it shows me JavaScript error in Console that "TypeError: document.getelementbyid(...) is null" This error is for code : document.getElementById("my_form").submit(); I am using Firefox 24.0 and Windows 7. I have installed only 1 add-on. That is 'Firebug 1.12.3'. This code works fine for other browsers Except Firefox. Please help me to solve this problem.