File upload field

Question

I have a profile update page, with a file field where the user can upload a photo.
But I have a major problem. I know that the fileupload form cannot contain a value from a database.
When I submit the form without the image, it resets the photo field to blank.
I would like to know:
How can I upload a photo with checking if the same name is already in the folder?
How can I leave the field intact so that the current image stays on blank field?
This is my code
SQL
if ((isset($_POST["MM_update"])) && ($_POST["MM_update"] == "update_business")) {
  $updateSQL = sprintf("UPDATE users SET company_name=%s, comp_add1=%s, comp_add2=%s, comp_add3=%s, comp_city=%s, comp_postcode=%s, comp_tel=%s, comp_fax=%s, comp_email=%s, comp_web=%s, comp_description=%s, honors_awards=%s, industry=%s, logo=%s, bul1=%s, bul2=%s, bul3=%s, bul4=%s, bul5=%s, bul6=%s WHERE user_id=%s",
                       GetSQLValueString($_POST['company_name'], "text"),
                       GetSQLValueString($_POST['comp_add1'], "text"),
                       GetSQLValueString($_POST['comp_add2'], "text"),
                       GetSQLValueString($_POST['comp_add3'], "text"),
                       GetSQLValueString($_POST['comp_city'], "text"),
                       GetSQLValueString($_POST['comp_postcode'], "text"),
                       GetSQLValueString($_POST['comp_tel'], "text"),
                       GetSQLValueString($_POST['comp_fax'], "text"),
                       GetSQLValueString($_POST['comp_email'], "text"),
                       GetSQLValueString($_POST['comp_web'], "text"),
                       GetSQLValueString($_POST['comp_description'], "text"),
                       GetSQLValueString($_POST['honors_awards'], "text"),
                       GetSQLValueString($_POST['industry'], "text"),
                       GetSQLValueString($_FILES['ufile']['name'], "text"),
                       GetSQLValueString($_POST['bul1'], "text"),
                       GetSQLValueString($_POST['bul2'], "text"),
                       GetSQLValueString($_POST['bul3'], "text"),
                       GetSQLValueString($_POST['bul4'], "text"),
                       GetSQLValueString($_POST['bul5'], "text"),
                       GetSQLValueString($_POST['bul6'], "text"),
                       GetSQLValueString($_POST['user'], "int"));
  mysql_select_db($database_db, $db);
  $Result1 = mysql_query($updateSQL, $db) or die(mysql_error());
  $updateGoTo = "home.php";
  if (isset($_SERVER['QUERY_STRING'])) {
    $updateGoTo .= (strpos($updateGoTo, '?')) ? "&" : "?";
    $updateGoTo .= $_SERVER['QUERY_STRING'];
  header(sprintf("Location: %s", $updateGoTo));
if ((isset($_POST["MM_update"])) && ($_POST["MM_update"] == "update_business")) {
  $updateSQL = sprintf("UPDATE users SET photo=%s WHERE user_id=%s",
                       GetSQLValueString($_FILES['ufile']['name'], "text"),
                       GetSQLValueString($_POST['user'], "int"));
  mysql_select_db($database_db, $db);
  $Result1 = mysql_query($updateSQL, $db) or die(mysql_error());
//define a maxim size for the uploaded images in Kb
define ("MAX_SIZE","50000");
//This function reads the extension of the file. It is used to determine if the file  is an image by checking the extension.
function getExtension($str) {
         $i = strrpos($str,".");
         if (!$i) { return ""; }
         $l = strlen($str) - $i;
         $ext = substr($str,$i+1,$l);
         return $ext;
//This variable is used as a flag. The value is initialized with 0 (meaning no error  found) 
//and it will be changed to 1 if an errro occures. 
//If the error occures the file will not be uploaded.
$errors=0;
//checks if the form has been submitted
if(isset($_POST['Submit']))
     //reads the name of the file the user submitted for uploading
     $image=$_FILES['ufile']['name'];
     //if it is not empty
     if ($image)
     //get the original name of the file from the clients machine
         $filename = stripslashes($_FILES['ufile']['name']);
     //get the extension of the file in a lower case format
          $extension = getExtension($filename);
         $extension = strtolower($extension);
     //if it is not a known extension, we will suppose it is an error and will not  upload the file, 
    //otherwise we will do more tests
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif"))
        //print error message
             echo '<h1>Unknown extension!</h1>';
             $errors=1;
         else
//get the size of the image in bytes
//$_FILES['image']['tmp_name'] is the temporary filename of the file
//in which the uploaded file was stored on the server
$size=filesize($_FILES['ufile']['tmp_name']);
//compare the size with the maxim size we defined and print error if bigger
if ($size > MAX_SIZE*1024)
    echo '<h1>You have exceeded the size limit!</h1>';
    $errors=1;
//we will give an unique name, for example the time in unix time format
//$image_name=time().'.'.$extension;
//the new name will be containing the full path where will be stored (images folder)
$newname="company_pics/".$image;
//we verify if the image has been uploaded, and print error instead
$copied = copy($_FILES['ufile']['tmp_name'], $newname);
if (!$copied)
    echo '<h1>Copy unsuccessfull!</h1>';
    $errors=1;
//If no errors registred, print the success message
if(isset($_POST['Submit']) && !$errors)
     echo "<h1>File Uploaded Successfully!</h1>";
<label>Upload Photo</label><br />
<input name="ufile" type="file" id="ufile" size="50" />
<br /><br />

Answer 1

Well I'm a newbie at OAS Portal so I used the Form based on a table and there in the FILE_ field I changed it from textbox to File Upload(binary), and then I ran the form and I filled all the textbox and then chose the file I wanted to upload I clicked on insert, then the row was inserted and then I tried to open the file but nothing happened!
=(
so probably is that the form is trying to save the file directly in the database right... so I must change the field type... right??