Try:
Code:
PANEL* squaretwo_pan = //another panel?
{
pos_x = 334;
pos_y = 234;
layer = 3;//
bmap = "MPanel.tga";
flags = SHOW;
}

function main()
{
squaretwo_pan.bmap=camera.bmap;
level_load("roller.wmb"); // load the level
}


I have a habit to put main at the bottom of the program. The rest is like your code