protected function isValid(bytes:ByteArray):Boolean
{
	var toReturn:Boolean = false;
 
	//take the file name and check it against jpg extensions to make sure it is a jpg
	var namePieces:Array = file.name.split(".");
	//I'm getting the file extension this lame way, bc for some reason file.type is null
	var extension:String = namePieces[namePieces.length -1];
 
	//if it is indeed a jpeg then we want to check the validity
	if(extension.toLowerCase() == 'jpg' || extension.toLowerCase() == 'jpeg')
	{
		//move to the second to last position in the bytearray
		bytes.position = bytes.bytesAvailable - 2;
 
		//get the last two bytes
		var secondToLastByte:uint = bytes.readUnsignedByte();
		var lastByte:uint = bytes.readUnsignedByte();
 
		//if the last two bytes don't match the EOI segment header at the end of the file
		//then we know it is invalid
 
		if((secondToLastByte == 255 && lastByte == 217) || (secondToLastByte == 217 && lastByte == 0))
		{
			toReturn = true;
		}
	}
	else
	{
		toReturn = true;
	}
 
	return toReturn;
}