mail with attachment

[golden_water]

This should be the part of sendin a 1.zip file through mail

$fileatt = "1.zip"; 
$fileatt_type = "application/octet-stream";  

$fileatt_name = "1.zip";
$email_from = "[e-mail]"; 
$email_subject = "a subject..."; 
$email_message = "hehe"; 
$email_to = "[e-mail]";  

$headers = "From: ".$email_from; 
$file = fopen($fileatt,'rb'); 
$data = fread($file,filesize($fileatt)); 
fclose($file); 

$semi_rand = md5(time()); 
$mime_boundary = "==Multipart_Boundary_x{$semi_rand}x"; 

$headers .= "\nMIME-Version: 1.0\n" . "Content-Type: multipart/mixed;\n" . " boundary=\"{$mime_boundary}\""; 

$email_message = "This is a multi-part message in MIME format.\n\n" . "--{$mime_boundary}\n" . "Content-Type: multipart/mixed; charset=\"big5\"\n" . "Content-Transfer-Encoding:7bit\n\n" . 
$email_message . "\n\n"; 

$data = chunk_split(base64_encode($data)); 

$email_message .= "--{$mime_boundary}\n" . "Content-Type: {$fileatt_type};\n" . " name=\"{$fileatt_name}\"\n" . 
"Content-Transfer-Encoding: base64\n\n" . 
$data . "\n\n" . 
"--{$mime_boundary}--\n"; 

$done = @mail($email_to, $email_subject, $email_message, $headers); 

My question
1.It can receipe 1.zip however I got a blank page that is no content there
2. I attach a 1.jep file it can also send it out but still a blank 1.jep
3.any solutions thanks