your animnation:
search the aums fot "animated panel"
but don't use a gif file, use png, tga, bmp, pcx instead!

your button and your main menu:
Use the manual, search for PANEL, button, Panel Flags
The description is very clear and you have good samples!

but one hint to you:
Code:
PANEL* pan_mainmenu = 
{
    flags = SHOW;
    button(32,32,"button.bmp","button.bmp","button.bmp",ClickEvent,NULL,NULL);
}

function ClickEvent()
{
    error("Button clicked!");
}

funtion mouse_startup()
{
    mouse_mode = 1;
    mouse_pointer = 3;
    while(1)
    {
        vec_set(mouse_pos,mouse_cursor);
        wait(1);
    }
}

function main()
{
    video_set(800,600,32,2);
}


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