PHP and GD imagecopyresized()

[eulet20]

Hi all!
I have a problem with the function imagecopyresized().
here is the code I use:

$src_image = imagecreatefromjpeg ("tmp/somepiconmyserver.jpg")

imagecopyresampled("tmp/thisshouldbemynewpic.jpg", $src_image, 0, 0, 0,0, 50, 50, 20, 20);

but unfortunately I get this error:
Warning: imagecopyresized(): supplied argument is not a valid Image resource in /blabla.../fileresizing.php

Can somebody help?
phpinfo gives me jpegsupport yes...
Thx a lot
eule

[eulet20]

Wll, thx for reading, I forgot that pice of code:

$dst_img=imagecreatetruecolor($width,$height);

Now it works!
Thx anyway!
Eule