Menu déroulant + anim flash = pb de z-index !!!

Bonjour,
Je viens de terminer un menu déroulant pour mon site perso.
Il fonctionne très bien sous Safari, FF(mac) et IE, mais sous Opéra (mac et peut-être pc) il se balade complètement, et ce uniquement sur les pages dans lesquelles sont inclues des anims flash...
Quelqu'un connait-il une solution à ce problème ?

voici une page avec flash
et une autre sans

et mon code css:

/*<group=styles généraux>*/

body {
	background: #000000 no-repeat url(images/draw/draw-grey.jpg) center 120px  fixed;
	text-align: center;
	margin: 0 0 15px;
	font: 12px 'Lucida Grande', Geneva, Arial, Verdana, sans-serif;
	padding-right: 20px;
	padding-bottom: 20px;
	padding-left: 20px;
	padding: 0;
}

p {
	font: 18px Times New Roman, Times, serif;
	text-align: justify;
}

b, strong {

}

.center {
	text-align: center;
}

.underline {
	text-decoration: underline;
}

tbody {
	background: url(images/page/transp-light.png);
}

td {
	padding: 5px;
	text-align: left;
}

.colgoch {
	width: 30%;
	text-decoration: underline;
	font-weight: bold;
	text-align: left;
	vertical-align: baseline;
}

.coldroite {
	width: 70%;
	vertical-align: baseline;
	text-align: justify;
	font-size: 16px;
}

a:link {
	text-decoration: none;
	color: #003c7d;
	text-shadow: 0px 0px 0px #000000;
}

a:visited {
	text-decoration: none;
	color: #003c7d;
	text-shadow: 0px 0px 0px #000000;
}

a:hover, a:active {
	color: black;
	text-shadow: 2px 2px 1px #d9d9d9;	
}

img {
	border-style: none;
}

.image-left {
	float: left;
	margin: 3px 3px 3px 0;
	padding: 3px 3px 3px 0;
}

.image-right {
	float: right;
	margin: 3px 0 3px 3px;
	padding: 3px 0 3px 3px;
}

object {
	border-style: none;
	z-index:-1;
}


	
/*</group>*/

/*<group=toolbar>*/

#navcontainer {
	position: relative;
	z-index:1000;
	font: 11px/1.9em Verdana;
	text-decoration: none;
	width: 831px;
	bottom: 1px;
	height: 65px;
	clear: both;
}

#navcontainer #current {
	text-shadow: 0px 0px 3px #white;
	background: none no-repeat;
}

#navcontainer .currentAncestor {
	color: #white;
	text-shadow: 0px 0px 1px #white;
	background: transparent;
}

/* Menu coulissant !! */

#navcontainer ul li ul {
	display: none;
}
#navcontainer ul li:hover>ul {
	display: block;
	position: relative;
	z-index:1000;
	background: transparent;
	top: 0;
	border-style: none;
}

/* niveau 1 */

#navcontainer ul {
	list-style: none;
	position: absolute;
	z-index: 1000;
    background: repeat-x url(images/colors/toolbar-black.gif);
	width: 831px;
	display: block;
	margin: 0;
	padding: 0;
}

#navcontainer ul li {
	display: block;
	float: left;
}


#navcontainer ul a{
	width: 115px;
	display: block;
	text-align: center;
	height: 20px;
	color: #d2d2d2;
	text-shadow: 0px 1px 0px #black;
	text-decoration: none;
	border-style: none;
	
}

#navcontainer ul  a:hover {
	color: white;
	text-shadow: 0px 0px 3px #white;
	text-decoration: none;
	border-style: none;
	cursor: hand;
}

/* niveau 2 */

#navcontainer ul ul {
	position: relative;
	top: 20px;
	background: transparent;
	display: block;
	width: 115px;
}

#navcontainer ul ul li {
	background: transparent url(images/colors/toolbar2.jpg);
	color: black;
	position: relative;
	float: none;
}

#navcontainer ul ul li.last {
	background: url(images/colors/toolbar3.gif);
	 
}

#navcontainer ul ul a {
	height: 25px;
	color: black;
	margin-right: 0;
	margin-left: 0;
	width: 115px;
	text-shadow: 0px 1px 0px #d6d6d6;
	text-decoration: none;
	border-style: none;
	color: #252525;
	background: transparent;
	display: block;
}



#navcontainer ul ul .currentAncestor {
	color: #0075ba;
	text-shadow: 0px 1px 0px #d6d6d6;
}

/*</group>*/

/*<group=global >*/

.standout, blockquote {
	border: inherit;
	color: #3f3f3f;
	margin: 0 10px;
	font-weight: bold;
	padding-right: 10px;
	padding-left: 10px;
}

h1 {
	font-family: Arial, Verdana, Helvetica, sans-serif;
	color: #000000;
	margin: 0px;
}

h2 {
	font-family: Arial, Verdana, Helvetica, sans-serif;
	color: #191919;
	margin: 0px;
}

h3 {
	font-family: Arial, Verdana, Helvetica, sans-serif;
	color: #000000;
	margin: 0px;
}

h4 {
}

h5 {
	
}

.imageStyle {
	border: 1px none transparent;
}
/*</group>*/

/*<group=layout>*/

.clearer {
	clear: both;
}

#container {
	text-align: left;
	margin-right: auto;
	margin-left: auto;
	padding: 0;
	width: 831px;
	background: url(images/page/transp1.png);
	margin-top: 10px;
}

#pageHeader {
	height: 143px;
	position: relative;
	background: transparent;
	margin: 0;
	padding: 0;
}

#contentContainer {
	margin-bottom: 6px;
	background: transparent;
	margin-top: 6px;
	font-weight: 500;
	line-height: 17px;
	font-family: Arial, Helvetica, sans-serif;
}

#contentContainer #content {
	padding: 10px;
	margin-right: 7px;
	margin-left: 0;
	font-size: 12pt;
	z-index:-1000;
}

#contentContainer #content .texte {
	background: url(images/page/transp-light.png);
	padding: 10px;
	font-size: 16pt;
	line-height: 1em;
}

#contentContainer #content .texte ol       {
	font-size: 16pt;
	line-height: 1em;
	font-weight: 500;
}

#sidebarContainer {
	width: 220px;
	float: right;
	clear: left;
	font-size: 11px;
	line-height: 16px;
	background: transparent ;
}

#sidebarContainer #sidebar {
	padding: 5px 10px;
	background: transparent repeat url(images/page/transp1.png);
}

#sidebarContainer .sideHeader {
	font-weight: bold;
	background: 0px transparent repeat url(images/page/transp-light.png);
	color: black;
	font-size: 12px;
	padding: 3px 10px;
	margin-bottom: 7px;
	margin-top: 7px;
	text-align: center;
}

#footer {
	text-align: right;
	padding-bottom: 0;
	margin-top: 0;
	margin-right: 0;
	margin-left: 0;
	height: 20px;
	font-size: 10pt;
	padding-right: 30px;
	padding-left: 30px;
	color: black;
}

#footer p {
	padding: 0;
	margin: 0;
}

#footer a:link, #footer a:visited {
	color: black;
	text-decoration: none;
	font-weight: bold;
	
}

#footer a:hover, #footer a:active {
	text-decoration: underline;
	color: black;	
}
	
/*</group>*/

/*<group=fil d'ariane>*/

#breadcrumbcontainer {
	text-align: center;
	background: transparent;
	font-size: 10pt;
	padding: 0 15px;
	line-height: 22px;
	margin-top: 0;
	margin-bottom: 0;
}

#breadcrumbcontainer ul {
	list-style: none;
	padding: 0;
}

#breadcrumbcontainer li {
	display: inline;
	padding: 0;
}

#breadcrumbcontainer a {
	text-decoration: none;
	color: black;
}

#breadcrumbcontainer a:hover {
	text-decoration: underline;
	color: black;
}
	
/*</group>*/

/*<group=formulaires>*/

fieldset {
	border: ridge #e6d1fb thin;
}
.message-text {font-size: 15px } 

.required-text {font-size: 15px } 

.form-input-field {
	background: #e9e9e9;
} 

.form-input-button { } 
/*</group>*/

/*<group=blog>*/

/* The archive page */

.blog-archive-background {
	text-align: center;
	font: 12px 'Lucida Grande', Geneva, Arial, Verdana, sans-serif;
}

.blog-archive-headings-wrapper {
	font-weight: bold;
	margin: 831px;
	background: url(images/page/transp1.png) repeat;
	height: 50px;
	text-align: left;
	padding: 10px;
	font-size: 15px;
}

.blog-archive-entries-wrapper {
	text-align: left; 
	text-align: left;
	background: white url(images/page/transp1.png) repeat;
	padding: 10px;
	margin: 831px;
}

.blog-archive-month {
	font-weight: bold;
	font-size: 24px;
	padding-bottom: 8px;
	text-align: left;
}

.blog-archive-link { 
}

/* end archive page */

.blog-entry {
	padding: 0px;
	margin-bottom: 25px;
}

.blog-entry-title {
	text-indent: 10px;
	font: bold 20px Geneva;
}

.blog-entry-date {
	margin-bottom: 15px;
	font-style: italic;
	font-size: 11px;	
	height: 17px;
	padding-right: 10px;
	padding-left: 10px;
	border-top: 1px solid gray;
}

.blog-entry-category {
}

.blog-category-link-enabled {
}

.blog-category-link-disabled {
}

.blog-entry-body {
	
	text-align: left;
	padding: 0px;
	font-family: 'Lucida Grande', Geneva, Arial, Verdana, sans-serif;
}

.blog-entry-comments {
	background: transparent url(images/page/transp-light.png)  repeat;
	border-bottom: 1px solid gray;
	margin-top: 5px;
	font-size: 11px;
	text-indent: 6px;
}

/*</group>*/