file download using header

I am having some trouble making it possible to download a file using the header function. The problems are: (1) I get the dialog box to download the file, but for some reason the type of file isn't getting passed to the box, and (2) when I download a 4MB file it only seems to be getting 16.6KB. I haven't used header for this purpose before this, so maybe I am missing something. I Googled around and found the content-disposition type I thought I needed, I actually tried 3 different types (the file is a compressed zip file). I Googled around for tutorials on downloading files and still haven't found the answer to correcting my problem. Here is the code I am using, maybe a couple more trained eyes looking at this could help me out. <?php $download = 'http://www.usa-financial.com'.urldecode( $_GET['link'] ); $type = urldecode( $_GET['type'] ); $size = filesize( '/home2/www/usa-financial'.urldecode( $_GET['link'] ) ); header("Content-type: $type"); header("Content-Disposition: attachment; filename=$download;"); header("Accept-Ranges: bytes"); header("Content-Length: $size"); echo "<!-- $type \n $size \n $download \n -->\n"; ?> Josh