General Question about how to encrypt-decrypt and Digital signatures

Hi,
We're developing classes for encrypting and signing a txt message and for decrypting and validating the signature of the message. Everything works properly but I have several questions, they're not about code:
1st We're encrypting the message following this way:
-generating a number which is gonna be the password
-encrypting the message in AES with this password
-encrypting the with the public certificate of the receiver the password
-We pack everything, encrypted message+ encrypted password in a File with public key of the receiver.
The questions we have for this issue are:
-Is it okay? or can I do it more efficiently.
-is it a standard for developing encrypting software? We've followed java api tutorials
-Can we decrypt this message using comercial software? it just plain text(of course if we have the private key)
2nd We take this message and we sign it with our private key
-We use CMS classes from bouncycastle libraries
The questions we have for this issue are:
- How can I check , with comercial software, whether this message is signed ok and is valid.
- How can I know whether this way of signing is in compliance with PKCS7-CMS standard?
Thanks in advance
if you need more information ask me

The file multiscreen.html apepars to do the following:
It tests if the browser is running on a "hand held device".
   This means it looks to see if the device name includes:
          "blackberry","android","iphone","ipad","symbian","smartphone","ios","windows ce","webos"
If the answer is Hand-held then the HTML5 published module is loaded. Otherwise it loads swf.
I can see no check that Flash player is loaded before making the choice, nor does it check the compatability of the HTML5 on the "hand held" device. In other  words it isn't very "smart"

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