Thumbnailing to a specific size

OK i have found the following code which works for me. However, i want to thumbnail the images to a specific size, so they will look nicer when displayed on my page. If I use just width and height attributes on the html img the picture will obviously be distorted unless it fits those proportions. Is there a way to create a thumbnail of specific length and width that crops a small piece of the picture (either vertically or horizontally)? That would be awesome. Any help is appreciated.

<?php
function Resize_Image($save,$file,$t_w,$t_h,$s_path,$o_path) {
$s_path = trim($s_path);
$o_path = trim($o_path);
$save = $s_path . $save;
$file = $o_path . $file;
$ext = strtolower(end(explode(‘.’,$save)));
list($width, $height) = getimagesize($file) ;
if(($width>$t_w) OR ($height>$t_h)) {
$r1 = $t_w/$width;
$r2 = $t_h/$height;
if($r1<$r2) {
$size = $t_w/$width;
}else{
$size = $t_h/$height;
}
}else{
$size=1;
}
$modwidth = $width * $size;
$modheight = $height * $size;
$tn = imagecreatetruecolor($modwidth, $modheight) ;
switch ($ext) {
case ‘jpg’:
case ‘jpeg’:
$image = imagecreatefromjpeg($file) ;
break;
case ‘gif’:
$image = imagecreatefromgif($file) ;
break;
case ‘png’:
$image = imagecreatefrompng($file) ;
break;
}
imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;
imagejpeg($tn, $save, 100) ;
return;
}
?>

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