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Is Null Or Not An Object


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I keep getting the document.getElementById(...) is null or not an object

<html><head><title></title></head><script type="text/javascript">var http = false;if(navigator.appName == "Microsoft Internet Explorer") {  http = new ActiveXObject("Microsoft.XMLHTTP");} else {  http = new XMLHttpRequest();}function validate(objName, objValue){var objResponse = document.getElementById("Msg_" + objName);  var params = "";  if(objName == "username")  {	params = "?name=" + objValue;  }   if(objName == "pwd")  {	 params = "?pwd=" + objValue;  }   if(objName == "email")  {	 params = "?email=" + objValue;  }  if(objName == "phone")  {	 params = "?phone=" + objValue;  } http.open("GET", "validate_form.php" + params, true);  http.onreadystatechange=function()	{	if(http.readyState == 4)		{	//This is where it is saying that the error is.  document.getElementById(objResponse).innerHTML = http.responseText;		}	  }  http.send(null);}</script><body><div align="center"> <form name="signup"><br><div id="Msg_username" </div><br>Your user name: <input type="text" name="username" id="username" size="26" maxlength="50" type="text" tabindex="1" onchange="validate('username', this.value)"/><br><div id="Msg_pwd" </div><br>Your password:  <input type="text" name="pwd" id="pwd" size="26" maxlength="25"  type="password" tabindex="2" onchange="validate('pwd', this.value)"/><br><div id="Msg_email" </div><br>Your email:   <input type="text" name="email" id="email" size="36" maxlength="36" tabindex="3" value="myemail@somewhere.com" onchange="validate('email', this.value)"/><br><div id="Msg_phone" </div><br>Cell phone number: <input name="phone" id= "phone" size="26" maxlength="25" type="text" size="20" tabindex="4" onchange="validate('phone', this.value)"/><br><input name="Submit" value="Create Account" type="submit" 	tabindex="6"> </form>			  </body></html>

Edited by user4fun
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for 1, you should put the script in the head section of your page<html>

<head><title></title><script type="text/javascript">...script here...</script></head>

Also, most of your div tags are not closed

<div id="Msg_email" </div>
make them
<div id="Msg_email"></div>

the main reason for your problem, if i am correct (besides the above problem) is that this line is incorrect:

document.getElementById(objResponse).innerHTML = http.responseText;

it should be

objResponse.innerHTML = http.responseText;

Edited by Pizzaguy
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Thank you so much, I did just run into another issue that I am kind off lost in.in my validation page, how would I know which params was submitted

if(objName == "username")  {	params = "?name=" + objValue;  }   if(objName == "pwd")  {	 params = "?pwd=" + objValue;  }   if(objName == "email")  {	 params = "?email=" + objValue;  }  if(objName == "phone")  {	 params = "?phone=" + objValue;  }

in my validate_form.php, I need to know which one I am going to try validating, so I only send back the result to the text field that was just changed.

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That is not going to do it$_GET['name'],, what if I am trying to get the $_GET['pwd'], then what. I cannot have a $_GET for aech one because if the use is working on the user name, then it will be send to the alidate_form.php and comes back with intructions. If I also have a $_GET['pwd'] at the same time, then another response will be send back saying that the pwd is empty. When in fact the user has not even gotten there yet.

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