PANEL* your_pan =								//your panel
{
	bmap = panel;
	pos_x = 50;
	pos_y = 705;
	layer = 6;
}
function turn_on()
{
	set(your_pan, SHOW);
}
PANEL* button_pan = 
{
	pos_x = 0;
	pos_y = 0;
	layer = 6;
	button(0, 0, on, off, over, NULL, NULL, NULL);
}

// Always define image filenames with the BMAP* pointer....
// Don't write the filename in the definition of buttons or panels!
// Do it like this:
BMAP* nxthhi = "nxt_hi.bmp";
BMAP* nxtorange = "nxtorange.bmp";

// Define a prototype of your function so it won't be an undeclared identifier:
function turn_on();

// Here, you DON'T set the SHOW flag. Also, VISIBLE is ONLY for old versions of A7,
// so don't use VISIBLE. Only use OVERLAY when you need black RGB(0,0,0) parts of 
//a bmap to be invisible
PANEL* nxthi_panel =
{
bmap = nxthhi;
pos_x = 275;
pos_y = 170;
layer = 3;
flags = OVERLAY; // DONT PUT SHOW OR VISIBLE! The function will do that when you click button!
}

PANEL* button_panel =
{
pos_x = 340;
pos_y = 165;
layer = 3;
button(0, 0, nxtorange, nxtorange, nxtorange, turn_on, NULL, NULL);
flags = OVERLAY | SHOW;
}

// Now turn it on when you click....
function turn_on()
{
 set(nxthi_panel, SHOW);
}