Is it possible with "upload from browser" to give an error message whene the file is to big!

Hey Everbody,

I'm new here.
But i have a question.
Is it possible with "upload from browser" to give an error message whene they try to upload a file that's more thene 300kb and resolution more thene 1024x768.
I know that there is a plugin "Size Limit".
But that don't work on my server.
And i think to know why.

I'm on a server where you got not enough memory, and they wouldn't make it bigger!
They also only use GD no Imagemagick or something else.

And i have read that whene you use "Size Limit".
It first gone upload the image and thene check the size.
But i can't upload thouse images.
You know what i can do?
Or how to make That error message?

If theres no answer to the above questions.
Wel you can help me with this, How can i remove the page "upload from browser"?
Because i will only use "publishxp"

Thx fo your time.