trying to post password via curl but getting a blank page instead of content

Question

i want to post my password to a page via curl and grab the result, result should be a page with a content.

here is my script

function f($password){

     $url="http://upload5.fileflyer.com/view/7MSG4GUCYVN7E";
     $useragent="Opera 9.7 (Windows NT 6.0; U; en)";
     $ref="http://fileflyer.com/view/7MSG4GUCYVN7E";

     $data = array();

     $data["__EVENTTARGET"] = "";
     $data["__EVENTARGUMENT"] = "";
     $data["__VIEWSTATE"] = "%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%2FdWlkPWk1MjZ1QkUfBAUtR2VuZXJhdGUgYSBGaWxlRmx5ZXIgQWZmaWxpYXRlIGRvd25sb2FkIGxpbmsuZGQCBA8WAh8AZxYCZg8WAh8AZ2QCCQ8PFgQfBGUfBQUmaHR0cDovL3VwbG9hZDUuZmlsZWZseWVyLmNvbS9mZWVkYmFjay9kZAIKDw8WCB8EBQhmYWNlYm9vax8GBQhmYWNlYm9vax8HBTdodHRwOi8vdXBsb2FkNS5maWxlZmx5ZXIuY29tL0lNRy9ib29rbWFya3MvZmFjZWJvb2suZ2lmHwUFVGh0dHA6Ly93d3cuZmFjZWJvb2suY29tL3NoYXJlci5waHA%2FdT1odHRwJTNBJTJGJTJGd3d3LmZpbGVmbHllci5jb20lMkZ2aWV3JTJGaTUyNnVCRWRkAgsPDxYIHwcFNmh0dHA6Ly91cGxvYWQ1LmZpbGVmbHllci5jb20vSU1HL2Jvb2ttYXJrcy90d2l0dGVyLnBuZx8GBQdUd2l0dGVyHwQFB1R3aXR0ZXIfBQVZaHR0cDovL3R3aXR0ZXIuY29tL2hvbWU%2Fc3RhdHVzPUNoZWNrK291dCt0aGlzK2ZpbGU6K2h0dHA6Ly93d3cuZmlsZWZseWVyLmNvbS92aWV3L2k1MjZ1QkVkZAIMDw8WCB8EBQtkZWwuaWNpby51cx8GBQtkZWwuaWNpby51cx8HBThodHRwOi8vdXBsb2FkNS5maWxlZmx5ZXIuY29tL0lNRy9ib29rbWFya3MvZGVsaWNpb3VzLmdpZh8FBYMBaHR0cDovL2RlbC5pY2lvLnVzL3Bvc3Q%2FdXJsPWh0dHA6Ly93d3cuZmlsZWZseWVyLmNvbS92aWV3L2k1MjZ1QkU%2BJnRpdGxlPUNoZWNrIG91dCB0aGlzIGZpbGU6IGh0dHA6Ly93d3cuZmlsZWZseWVyLmNvbS92aWV3L2k1MjZ1QkVkZAINDw8WCB8EBQRkaWdnHwYFBGRpZ2cfBwU2aHR0cDovL3VwbG9hZDUuZmlsZWZseWVyLmNvbS9JTUcvYm9va21hcmtzL2RpZ2dtYW4uZ2lmHwUFb2h0dHA6Ly9kaWdnLmNvbS9zdWJtaXQ%2FcGhhc2U9MiZ1cmw9aHR0cDovL3d3dy5maWxlZmx5ZXIuY29tL3ZpZXcvaTUyNnVCRSZ0aXRsZT1DaGVjayBvdXQgdGhpcyBmaWxlJnRodW1ibmFpbHM9MGRkAg4PDxYIHwQFBXNpbXB5HwYFBXNpbXB5HwcFNGh0dHA6Ly91cGxvYWQ1LmZpbGVmbHllci5jb20vSU1HL2Jvb2ttYXJrcy9zaW1weS5wbmcfBQV5aHR0cDovL3d3dy5zaW1weS5jb20vc2ltcHkvTGlua0FkZC5kbz9ocmVmPWh0dHA6Ly93d3cuZmlsZWZseWVyLmNvbS92aWV3L2k1MjZ1QkUmdGl0bGU9Q2hlY2sgb3V0IHRoaXMgZmlsZSZ0YWdzPUZpbGVGbHllcmRkAg8PDxYIHwQFDWJsaW5rbGlzdC5jb20fBgUNYmxpbmtsaXN0LmNvbR8HBThodHRwOi8vdXBsb2FkNS5maWxlZmx5ZXIuY29tL0lNRy9ib29rbWFya3MvYmxpbmtsaXN0LmdpZh8FBa0BaHR0cDovL3d3dy5ibGlua2xpc3QuY29tL2luZGV4LnBocD9BY3Rpb249QmxpbmsvYWRkYmxpbmsucGhwJkRlc2NyaXB0aW9uPUNoZWNrIG91dCB0aGlzIGZpbGU6JlVybD1odHRwOi8vd3d3LmZpbGVmbHllci5jb20mdGl0bGU9RmlsZUZseWVyIC0gU3RvcmUgYW5kIFNlbmQgeW91ciBmaWxlcywgZmFzdCFkZAIQDw8WCB8HBTVodHRwOi8vdXBsb2FkNS5maWxlZmx5ZXIuY29tL0lNRy9ib29rbWFya3MvcmVkZGl0LmdpZh8GBQZyZWRkaXQfBAUGcmVkZGl0HwUFhwFodHRwOi8vcmVkZGl0LmNvbS9zdWJtaXQ%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%3D%3D";
     $data["__EVENTVALIDATION"] = "%2FwEWBQLm%2FfKcCwK%2F5YSJDgKAyMzWCwKC15ybDwK1%2BaKAD8V4zaNGoOIsL1kYesHPHz%2B%2Fxxtu";
     $data["SMSButton"] = "Go";
     $data["Password"] = $password;
     $data["TextBox1"] = "";


            $ch = curl_init();
            curl_setopt($ch,CURLOPT_URL,$url);
            curl_setopt($ch,CURLOPT_REFERER,$ref);
            curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
            curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);
            curl_setopt($ch,CURLOPT_POST,1);
            curl_setopt($ch,CURLOPT_USERAGENT,$useragent);
            curl_setopt($ch,CURLOPT_POSTFIELDS,$data);

            $result=curl_exec($ch);
            echo $result;
            curl_close($ch);
}

when i run my script i get the result in the $result var. but $result is empty.

curl executed fine.

no error in curl_error($ch);

curl_info($ch) say

 ( [url] => upload5.fileflyer.com/view/7MSG4GUCYVN7E 
   [content_type] => 
   [http_code] => 200 
   [header_size] => 331 
   [request_size] => 306 
   [filetime] => -1 
   [ssl_verify_result] => 0 
   [redirect_count] => 0 
   [total_time] => 1.81 
   [namelookup_time] => 0.733 
   [connect_time] => 0.983 
   [pretransfer_time] => 0.983 
   [size_upload] => 4455 
   [size_download] => 0 
   [speed_download] => 0 
   [speed_upload] => 2461 
   [download_content_length] => -1 
   [upload_content_length] => 4455 
   [starttransfer_time] => 1.232 
   [redirect_time] => 0 )

someone can help me please?