switch($file_extension){
	  case "pdf": $ctype="application/pdf"; break;
	  case "exe": $ctype="application/octet-stream"; break;
	  case "zip": $ctype="application/zip"; break;
	  case "rar": $ctype="application/rar"; break;
	  case "doc": $ctype="application/msword"; break;
	  case "xls": $ctype="application/vnd.ms-excel"; break;
	  case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
	  case "gif": $ctype="image/gif"; break;
	  case "png": $ctype="image/png"; break;
	  case "jpeg":
	  case "jpg": $ctype="image/jpg"; break;
	  default: $ctype="application/proses";
	}