How would i make a button with the starting text c_black then when the mouse is in the sprite it lights up to c_white, and then when the mouse leaves the sprite it goes back to black, im thniking about image_alpha?

you want to have a sprite of the normal and the highlighted button(can be the same sprite with a subimage)
www.grsites.com has a custom button maker that provides that
under mouse event mouse enter event set image_index 1
mouse leave set image_index 0
set image speed 0 at all times

i no how to do that, i wanted it to fade in and out

if (mouse_x > x&&mouse_x < sprite_width&&mouse_y > y&&mouse_y < sprite_height&& image_alpha < 1)
{
image_alpha += 0.1
}
else
if image_alpha > 0 image_alpha -= 1

i didn't try this code so its posible it wouldn't work

I've posted a tutorial of it here.
Hope it helps.

Miner's code is missing something very important. I'll leave what that is as an exercise to the reader.

i have no clue whats missin', is it that it goes below negative 0 and also my mouse doesnt have to be on ti to start fading
also it fades the wrong way

QuoteMiner's code is missing something very important. I'll leave what that is as an exercise to the reader.
i didn't test it so i don't know whats wrong with it.

well i used darth's example so its working now, thanks

Quotewell i used darth's example so its working now, thanks
Glad to hear it. If you need anything else, don't hesitate to ask.

Hint: What does it mean for mouse_x to be less than sprite_width? Significantly, where will the mouse pointer be?

Also, when the sprite hits maximum alpha, it will start to flash due to inadequate condition logic.

if(mouse_x < x + sprite_width)
=> the mouse pointer is at the left of the RIGHT-SIDE of the object.
So if you want to check if the mouse is over the object (horizontally):
mouse_x >= x AND
mouse_x < x + sprite_width