Post HTTP data - script error

 
Hi,

I want to create a script that sends POST data to a specific URL and reads the response. I've used the wininet.dll library, but I have problem posting the data. I followed the instructions on MSDN's help for the wininet.dll, but the post data is not sent. I've attached the script. If someone can take a look and tell me what's wrong I'd be very greatful!
Files:
webget.mq4  5 kb
Reason: