Help with php image uploader coding

[TaZzY]

Heya,

 

I've been trying to work on creating thumbnail img uploaders... Im wanting to make the coding output  aka the echo after uploading the image come out with the following result:

 

Full size Image: [img=http://main website address here]

Thumnail Image: [url=http://main website address here][img=100x50]http://main website address here[/img][/url]  

 

The current code I have is the following:

 

<?php

if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/pjpeg"))
&& ($_FILES["file"]["size"] < 5000000))
  {
  if ($_FILES["file"]["error"] > 0)
    {
    echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
    }
  else
    {
        
    if (file_exists("upload/" . $_FILES["file"]["name"]))
      {
      echo $_FILES["file"]["name"] . "File name already exists!";
      }
    else
      {
      move_uploaded_file($_FILES["file"]["tmp_name"],
      "upload/" . $_FILES["file"]["name"]);
      echo "[img]http://main website address here/" . "upload/" . $_FILES["file"]["name"];
      }
    }
  }
else
  {
  echo "Invalid file";
  }
?>[/img]</font></center></body>

 

What do I need to change in the above to make echo that first code. I'd appreciate all the help I can get in this