Align problem - z-index issue

[ilya Kraft]

Hello,

Right, I have a header and a small div .sideShadow, I need .shideShadow div to be behind a #sideTopHeader div, right now it is on the top of it, you can see it here (to your right)

http://inelmo.com

CSS I use now

#sideTopHeader {
background: #333333;
z-index: 1;
position: relative;
height: 50px;
margin: 0 -30px 0 0;

-webkit-border-radius: 7px 7px 0 7px;
-khtml-border-radius: 7px 7px 0 7px;
-moz-border-radius: 7px 7px 0 7px;
border-radius: 7px 7px 0 7px;
}

.sideShadow {
border-color: transparent transparent transparent #1f1f1f;
border-width: 15px;
border-style: solid;
height: 0;
width: 0;
position: absolute;
top: 35px;
left: 395px;
z-index: 0;
}

[ilya Kraft]

Solved, removed z-index from #sideTopHeader and changed z-index tom -1 in .sideShadow