I really cant see what you got going on. I dont know if your useing as3 or as2.

But I can tell you what I would do
open flash

goto file new
goto flashfile actionscript 2.0

then goto save file rename it banner

now goto file import import to libary your banner image you have.

Now goto your timeline and make 3 layers and name them
Action
Buttons
Banner

The Action Timeline will be your code clip.
The Buttons Timeline will be where your three buttons are.
And your Banner timeline will be your banner image.

Ok go to the action timeline frame and click the right mouse and look for Action then open that up

The code you want is this.
Actionscript Code:
stop();
button1.onRelease= function()
{
getURL("http://somelink.com/index.php","_self");
};
button2.onRelease= function()
{
getURL("http://somelink.com/index.php","_self");
};
button3.onRelease= function()
{
getURL("http://somelink.com/index.php","_self");
};

Now go to the timeline buttons and click the center of the design page and draw a box with your drawing tools.
Then right click the box you just drew and create a button.

Now click that button and look for properties box and give the button a instance name
button1.

repeat 2 more times.