images dont listen to margins

have a problem.
I want to center my page and was told to put my margins as {margin-right: auto; margin-left: auto;} I have done this and my text centers in the middle of the page. my images however do not do this.

my css looks like this:

#containertext {
margin-left: auto;
margin-right: auto;
width: 500px;
}

#green {
top: 390;
left: 120;
}

#carbon {
top: 270;
left: 480;
}

#lib {
top: 255;
left: 210;
}

#yougov {
top: 250
}

#iraq {
top: 390;
left: 380;
}

#bodytext {
top: 20;
}

#green, #carbon, #lib, #yougov, #iraq, #header, #bodytext {
position: absolute;
}

and i have put a division with the id of "container" around the whole page.
Does anyone have the answer?

Could you post the page code or link to it so we can see how the images are set?

Images are inline elements—which don't respond to margins—and so you need to declare them block-level elements first…

img {
display: block;
margin: 0 auto;
}

Hope this helps…

Images are inline elements—which don't respond to margins—and so you need to declare them block-level elements first…

img {
display: block;
margin: 0 auto;
}

Hope this helps…

Thanks that was really helpful.:)