IE not positioning divs correctly

[vamvam33]

My site is fine in other browsers, but in IE, my "main-box" area overlaps my the other content. I think its a div error, but I've tried chaning things and cannot make it work.

Site: http://www.vamdesign.com

css:
#container {
height: 768px;
width: 1024px;
z-index:-1;
background-image: url(images/VAMDesignbkg.png);
background-repeat: no-repeat;
position: absolute;
margin-left: -512px;
left: 50%;
padding: 0px;
}
#main-box {
position:absolute;
width:640px;
height:480px;
z-index:-1;
background-color: #FFF;
top: 42px;
left: 184px;
border-radius: 25px;
-moz-border-radius: 25px;
-webkit-border-radius: 25px;
behavior:url(border-radius.htc);
border: 1px solid #050DAE;
margin: 0px;
padding: 0px;
}


html:
<div id="container">
<div id="main-box">
<div id="iamdesign">
<img src="images/iamdesign.png" width="213" height="32" alt="iamdesign" /></div>
<div id="text-here">
<h1>Hi, I’m Vicki A. Morawietz &amp; I AM a Visual Designer, Art Director, GUI, &amp; UI designer, <span class="ninja">photoshop</span> <span class="ninja">ninja, </span>&amp; <span class="guru">illustrator</span> <span class="guru">guru</span>.</h1>
<ul class="navlist">
<li>Success in web design, user interface, and print for fortune 500 companies <br />
</li>
<li>Creative skills that exceed design trends and drive sales<br />
</li>
<li>Adaptive and comfortable in small scale or executive corporations<br />
</li>
<li>Ambitious with excellent leadership skills</li>
</ul>
<p class="space">I have excellent attention to detail, am well organized, efficient, and able to communicate creative ideas from concept to delivery. I enjoy challenges, have owned and operated my own graphic design business, built a creative services department from the ground up, as well as managed a team of graphic designers. I always strive to move forward in design and in life.<a href="contact.html"> Contact me.</a><br />
</p>
<div id="buttonplace">
<p> <a href="VMorawietz.pdf" class="download">Download Resume</a></p>
<div id="webdesign">
</div>
</div>

I've tried to change the z-index of #container to -1 and when I do, the background image goes to the background but then I loose all the info that is in the #main-box, when I change that z-index for #main-box, nothing changes.

Let me know if you need the full css. I'm at a loss here.

Thank you.