Logging on a site with CURL and redirecting into the site

Hello all,

Using PHP and CURL I am trying to login into a client's site on their login page.  Once logged in, I need the browser to open up the page that the login page redirects to (https://www.abc-ca.org/main_page.asp).  Manually if I login then I will be properly redirected to https://www.abc-ca.org/main_page.asp.

I need to simulate that process in my php script so that the browser will log in and end up at the redirected page https://www.abc-ca.org/main_page.asp.  Using my attached code I am able to properly authenticate and using the echo(curl_exec($curl)) line, I can see the page but within my current page not a redirected page.  Also since this is running locally and only retrieving the resulting html, none of the graphics from the destination page show  This is not exactly what I want.  I want to be able to be authenticated and properly redirected to https://www.abc-ca.org/main_page.asp.

I tried to use the header ( 'Location: '.$url) syntax to redirect to https://www.abc-ca.org/main_page.asp but that didn't work since it seems to be passing a get instead of a post.  I thought that the folllowlocation option would do it for me but that wasn't the case.

FYI.  The spec for the login page from the client is as follows:

<form id="frmSender" action="https://www.abc-ca.org/login.asp" method="post">
<input type="hidden" id="UserID" name="UserID" runat="server" value="" />
<input type="hidden" id="Password" name="Password" runat="server" value="" />
<input type="button" value="send it" onclick="javascript:submit();" />
</form>
 

Can somebody tell me what code I need to add after my authentication so that I can be properly redirected to  https://www.abc-ca.org/main_page.asp?

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<?php
 
  $url = "https://www.abc-ca.org/LOGIN.ASP";
  $curl = curl_init();
  $curlPost = 'UserID=12345&Password=654321&Login=Login&return=&return=';
  curl_setopt($curl, CURLOPT_USERAGENT, "$_SERVER[HTTP_USER_AGENT]");
  curl_setopt($curl, CURLOPT_HEADER, 0);
  curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);  // this line makes it work under https
  curl_setopt($curl, CURLOPT_SSL_VERIFYHOST,  1);
  curl_setopt($curl, CURLOPT_URL, $url);
  curl_setopt($curl, CURLOPT_CRLF, 1);
  curl_setopt($curl, CURLOPT_COOKIEFILE, "cookie.txt");
  curl_setopt($curl, CURLOPT_COOKIEJAR, "cookie.txt");
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($curl, CURLOPT_POST, 1);
  curl_setopt($curl, CURLOPT_POSTFIELDS, $curlPost);
  echo(curl_exec($curl));
  curl_close($curl);
?>