<a> Tag Not Working in Opera/Firefox z-index problem

[iGeekiHackiMatt]

okay So I Have A Few Websites That Use Div Wrappers so I Can Have "Fixed" Content In IE, Well in That "Fixed" Content I Have Links, EveryThing Works Fine In Internet Explorer (For Once), But Not In Opera, Or Firefox, I Just Narrowed it Down To The z-index, here is Some Code,,,

			#Fixed{
				position: Fixed;
				_position: Absolute;
				background-color: black;
				top: 50%;
				bottom: 50%;
				width: 200px;
				height: 100px;
				z-index: 0;
				}
			#Wrapper{
				position: relative;
				border: 0px;
				margin: 0px;
                                             padding: 0px;
				max-height: 100%;
				overflow: auto;
				color: white;
				z-index: 1;
				}

if i move the fixed up it will work, how can i make it work when it is in the other z-index? Thanks For Any/All Help...