watermark png no resize

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hi
i was wondering if anyone can help me out with this watermark script my problem is that the png image is resizing with all my images i have to watermark in the folder here is 2 link so you can see what im talking about im trying to get it so it will stay one size and not strech thanks....

Link 1:
[url=http://www.singlespleasures.com/member/index.php?pag=member_profile&member_id=280]http://www.singlespleasures.com/member/index.php?pag=member_profile&member_id=280[/url]

Link 2:
[url=http://www.singlespleasures.com/member/index.php?pag=member_profile&member_id=3]http://www.singlespleasures.com/member/index.php?pag=member_profile&member_id=3[/url]

Watermark code:
[code]<?


// IMAGE WATERMARK (comment line below if you do not want to use image watermark)
Define('WATERMARK_IMAGE', './wt.png'); // path to watermark image
Define('WATERMARK_PERCENT', '100'); // Intensity of the transition (in percent)


// TEXT WATERMARK (comment line below if you do not want to use text)
//Define('WATERMARK_TEXT', 'SinglesPleasures.com'); // text to place (image will not be used)
//Define('WATERMARK_TEXT_FONT', '4'); // font 1 / 2 / 3 / 4 / 5
// Define('TEXT_SHADOW', '0'); // 1 - yes / 0 - no
//Define('TEXT_COLOR', '#FFFFFF'); // text color 


// GENERAL SETTINGS
Define('WATERMARK_ALIGN_H', 'right'); // left / right / center
Define('WATERMARK_ALIGN_V', 'bottom'); // top / bottom / center
Define('WATERMARK_MARGIN', '0'); // margin

// ----------------------------------------------------------------------------------------

$dr=preg_replace('/modify\.php.+/', '', $_SERVER['PHP_SELF']);
$filename=str_replace($dr, './', $_SERVER['PATH_INFO']);

$lst=GetImageSize($filename);
$image_width=$lst[0];
$image_height=$lst[1];
$image_format=$lst[2];

if ($image_format==1) {
  Header("Content-Type:image/gif");
  readfile($filename);
  exit;
} elseif ($image_format==2) {
  $old_image=imagecreatefromjpeg($filename);
} elseif ($image_format==3) {
  $old_image=imagecreatefrompng($filename);
} else {
  readfile($filename);
  exit;
}


if (Defined('WATERMARK_TEXT') && WATERMARK_TEXT!='' && ($image_height>192 || $image_width>192)) {
// text


  $color = eregi_replace("#","", TEXT_COLOR);
  $red = hexdec(substr($color,0,2));
  $green = hexdec(substr($color,2,2));
  $blue = hexdec(substr($color,4,2));

  $text_color = imagecolorallocate ($old_image, $red, $green, $blue); 

  $text_height=imagefontheight(WATERMARK_TEXT_FONT);
  $text_width=strlen(WATERMARK_TEXT)*imagefontwidth(WATERMARK_TEXT_FONT);
  $wt_y=WATERMARK_MARGIN;
  if (WATERMARK_ALIGN_V=='top') {
  $wt_y=WATERMARK_MARGIN;
  } elseif (WATERMARK_ALIGN_V=='bottom') {
  $wt_y=$image_height-$text_height-WATERMARK_MARGIN;
  } elseif (WATERMARK_ALIGN_V=='center') {
  $wt_y=(int)($image_height/2-$text_height/2);
  }

  $wt_x=WATERMARK_MARGIN;
  if (WATERMARK_ALIGN_H=='left') {
  $wt_x=WATERMARK_MARGIN;
  } elseif (WATERMARK_ALIGN_H=='right') {
  $wt_x=$image_width-$text_width-WATERMARK_MARGIN;
  } elseif (WATERMARK_ALIGN_H=='center') {
  $wt_x=(int)($image_width/2-$text_width/2);
  }

  if (TEXT_SHADOW=='1') {
  imagestring($old_image, WATERMARK_TEXT_FONT, $wt_x+1, $wt_y+1, WATERMARK_TEXT, 0);
  }
  imagestring($old_image, WATERMARK_TEXT_FONT, $wt_x, $wt_y, WATERMARK_TEXT, $text_color);

} 
  if (Defined('WATERMARK_IMAGE') && WATERMARK_IMAGE!='' && ($image_height>192 || $image_width>192)) {

// image


$lst2=GetImageSize(WATERMARK_IMAGE);
$image2_width=$lst2[0];
$image2_height=$lst2[1];
$image2_format=$lst2[2];

if ($image2_format==2) {
  $wt_image=imagecreatefromjpeg(WATERMARK_IMAGE);
} elseif ($image2_format==3) {
  $wt_image=imagecreatefrompng(WATERMARK_IMAGE);
}

  if ($wt_image) {

  $wt_y=WATERMARK_MARGIN;
  if (WATERMARK_ALIGN_V=='top') {
    $wt_y=WATERMARK_MARGIN;
  } elseif (WATERMARK_ALIGN_V=='bottom') {
    $wt_y=$image_height-$image2_height-WATERMARK_MARGIN;
  } elseif (WATERMARK_ALIGN_V=='center') {
    $wt_y=(int)($image_height/2-$image2_height/2);
  }

  $wt_x=WATERMARK_MARGIN;
  if (WATERMARK_ALIGN_H=='left') {
    $wt_x=WATERMARK_MARGIN;
  } elseif (WATERMARK_ALIGN_H=='right') {
    $wt_x=$image_width-$image2_width-WATERMARK_MARGIN;
  } elseif (WATERMARK_ALIGN_H=='center') {
    $wt_x=(int)($image_width/2-$image2_width/2);
  }

  imagecopymerge($old_image, $wt_image, $wt_x, $wt_y, 0, 0, $image2_width, $image2_height, WATERMARK_PERCENT);
  }

}

if ($image_format==2) {
  imageJpeg($old_image);
}
if ($image_format==3) {
  imagePng($old_image);
}


?> [/code]

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anyone no how to do this its the last thing ineed done for this? ???