Is possible to allow users to upload their own graphics, and do not rely on the fact that they will know what to write in the html code?
What the code should look like?

@Zbyszek
No as they could easily upload some script that would i.e. remove your site or create script that will upload thousands of images per second.

Okay.
 I could not react to this message.
Why do I have the impression that this plugin has been done incomplete without a previous query?
On this page people should expect support which makes sense to spend money on the plugin.

I'm not a programmer, but I'm pretty sure this can be fixed with several lines of code.
In addition, there are many references for that, SQL injection is past, I believe that it should not be discussed.


Second thing, Osclass is an advertising platform, and should be user friendly configured right?
So, I wonder what the purpose if a user has to put his banner through html?
Does not know anyone to use html code to upload images from a third party source.
Should a client need to engage someone who knows html for inserting an image instead of him?
The question is what is the purpose of this plugin then?


Do not misunderstand me, I'm just trying to be objective.
Let me know if I'm wrong .


Regards

@Darko
Noone expects standard user will pay for banner.