capas que tapan el menú

[Leti13]

Bueno,me he vuelto a atascar un poco...
En la página que estoy ''intentando'' hacer, www.dbff.galeon.com ,tengo un menú dinámico, el problema viene cuando pongo una tabla o una capa. Al ponerlas,si despliego el menú no se ve porque lo tapan la capa o la tabla (no sé si me explico bien)
¿Hay alguna forma de que no se tape?
Gracias por adelantado

[Leti13]

Por si sirve de algo pongo el código del menú

if (document.all) {n=0;ie=1;ns6=0;fShow="visible";fHide="hidden";}
if (document.getElementById&&!document.all) {n=0;ie=0;ns6=1;fShow="visible";fHide="hidden";}
if (document.layers) {n=1;ie=0;ns6=0;fShow="show";fHide="hide";}

//Top Nav bar script v2.1- http://www.dynamicdrive.com/dynamicindex1/sm/index.htm

opr6=ie&&navigator.userAgent.indexOf("Opera")!=-1

window.onerror=new Function("return true")
////////////////////////////////////////////////////////////////////////////
// Function Menu() //
////////////////////////////////////////////////////////////////////////////
rightX = 0;
function Menu()
{
this.bgColor = menucolor;
if (ie) this.menuFont = "bold 12px Arial"; //default font settings. Don't change. Instead, modify stylesheet in sample.htm
if (n) this.menuFont = "bold 12px Verdana";
this.fontColor = "black";

this.addItem = addItem;
this.addSubItem = addSubItem;
this.showMenu = showMenu;
this.mainPaneBorder = 0;
this.subMenuPaneBorder = 0;

this.subMenuPaneWidth = submenuwidth;

lastMenu = null;

rightY = 0;
leftY = 0;
leftX = 0;

HTMLstr = "";
HTMLstr += "<!-- MENU PANE DECLARATION BEGINS -->\n";
HTMLstr += "\n";
if (ie||ns6) HTMLstr += "<div id='MainTable' style='position:absolute;top:0;left:0;'>\n";
// if (n) HTMLstr += "<layer name='MainTable'>\n";
HTMLstr += "<table width='100%' bgcolor='"+this.bgColor+"' border='"+this.mainPaneBorder+"'>\n";
HTMLstr += "<tr>";
if (n) HTMLstr += "<td>&nbsp;";
HTMLstr += "<!-- MAIN MENU STARTS -->\n";
HTMLstr += "<!-- MAIN_MENU -->\n";
HTMLstr += "<!-- MAIN MENU ENDS -->\n";
if (n) HTMLstr += "</td>";
HTMLstr += "</tr>\n";
HTMLstr += "</table>\n";
HTMLstr += "\n";
HTMLstr += "<!-- SUB MENU STARTS -->\n";
HTMLstr += "<!-- SUB_MENU -->\n";
HTMLstr += "<!-- SUB MENU ENDS -->\n";
HTMLstr += "\n";
if (ie||ns6) HTMLstr+= "</div>\n";
// if (n) HTMLstr+= "</layer>\n";
HTMLstr += "<!-- MENU PANE DECALARATION ENDS -->\n";
}

function addItem(idItem, text, hint, location, altLocation)
{
var Lookup = "<!-- ITEM "+idItem+" -->";
if (HTMLstr.indexOf(Lookup) != -1)
{
alert(idParent + " already exist");
return;
}
var MENUitem = "";
MENUitem += "\n<!-- ITEM "+idItem+" -->\n";
if (n)
{
MENUitem += "<ilayer name="+idItem+">";
MENUitem += "<a href='.' class=clsMenuItemNS onmouseover=\"displaySubMenu('"+idItem+"')\" onclick=\"return false;\">";
MENUitem += "|&nbsp;";
MENUitem += text;
MENUitem += "</a>";
MENUitem += "</ilayer>";
}
if (ie||ns6)
{
MENUitem += "<td>\n";
MENUitem += "<div id='"+idItem+"' style='position:relative; font: "+this.menuFont+";'>\n";
MENUitem += "<a ";
MENUitem += "class=clsMenuItemIE ";
// MENUitem += "style='text-decoration: none; font: "+this.menuFont+"; color: "+this.fontColor+"; cursor: hand;' ";
if (hint != null)
MENUitem += "title='"+hint+"' ";
if (location != null)
{
MENUitem += "href='"+location+"' ";
MENUitem += "onmouseover=\"hideAll()\" ";
}
else
{
if (altLocation != null)
MENUitem += "href='"+altLocation+"' ";
else
MENUitem += "href='.' ";
MENUitem += "onmouseover=\"displaySubMenu('"+idItem+"')\" ";
MENUitem += "onclick=\"return false;\" "
}
MENUitem += ">";
MENUitem += "|&nbsp;\n";
MENUitem += text;
MENUitem += "</a>\n";
MENUitem += "</div>\n";
MENUitem += "</td>\n";
}
MENUitem += "<!-- END OF ITEM "+idItem+" -->\n\n";
MENUitem += "<!-- MAIN_MENU -->\n";

HTMLstr = HTMLstr.replace("<!-- MAIN_MENU -->\n", MENUitem);
}

function addSubItem(idParent, text, hint, location, linktarget)
{
var MENUitem = "";
Lookup = "<!-- ITEM "+idParent+" -->";
if (HTMLstr.indexOf(Lookup) == -1)
{
alert(idParent + " not found");
return;
}
Lookup = "<!-- NEXT ITEM OF SUB MENU "+ idParent +" -->";
if (HTMLstr.indexOf(Lookup) == -1)
{
if (n)
{
MENUitem += "\n";
MENUitem += "<layer id='"+idParent+"submenu' visibility=hide bgcolor='"+this.bgColor+"'>\n";
MENUitem += "<table border='"+this.subMenuPaneBorder+"' bgcolor='"+this.bgColor+"' width="+this.subMenuPaneWidth+">\n";
MENUitem += "<!-- NEXT ITEM OF SUB MENU "+ idParent +" -->\n";
MENUitem += "</table>\n";
MENUitem += "</layer>\n";
MENUitem += "\n";
}
if (ie||ns6)
{
MENUitem += "\n";
MENUitem += "<div id='"+idParent+"submenu' onmouseout=operahide() style='position:absolute; visibility: hidden; z-index:100; width: "+this.subMenuPaneWidth+"; font: "+this.menuFont+"; top: -300;'>\n";
MENUitem += "<table border='"+this.subMenuPaneBorder+"' bgcolor='"+this.bgColor+"' width="+this.subMenuPaneWidth+">\n";
MENUitem += "<!-- NEXT ITEM OF SUB MENU "+ idParent +" -->\n";
MENUitem += "</table>\n";
MENUitem += "</div>\n";
MENUitem += "\n";
}
MENUitem += "<!-- SUB_MENU -->\n";
HTMLstr = HTMLstr.replace("<!-- SUB_MENU -->\n", MENUitem);
}

Lookup = "<!-- NEXT ITEM OF SUB MENU "+ idParent +" -->\n";
if (n) MENUitem = "<tr><td><a class=clsMenuItemNS title='"+hint+"' href='"+location+"' target='"+linktarget+"'>"+text+"</a><br></td></tr>\n";
if (ie||ns6) MENUitem = "<tr><td><a class=clsMenuItemIE title='"+hint+"' href='"+location+"' target='"+linktarget+"'>"+text+"</a><br></td></tr>\n";
MENUitem += Lookup;
HTMLstr = HTMLstr.replace(Lookup, MENUitem);

}

function showMenu()
{
document.writeln(HTMLstr);
}

////////////////////////////////////////////////////////////////////////////
// Private declaration
function displaySubMenu(idMainMenu)
{
var menu;
var submenu;
if (n)
{
submenu = document.layers[idMainMenu+"submenu"];
if (lastMenu != null && lastMenu != submenu) hideAll();
submenu.left = document.layers[idMainMenu].pageX;
submenu.top = document.layers[idMainMenu].pageY + 25;
submenu.visibility = fShow;

leftX = document.layers[idMainMenu+"submenu"].left;
rightX = leftX + document.layers[idMainMenu+"submenu"].clip.width;
leftY = document.layers[idMainMenu+"submenu"].top+
document.layers[idMainMenu+"submenu"].clip.height;
rightY = leftY;
} else if (ie||ns6) {
//alert(document.getElementById(idMainMenu+"submenu" ).id)
menu = ie? eval(idMainMenu) : document.getElementById(idMainMenu);
submenu = ie? eval(idMainMenu+"submenu.style") : document.getElementById(idMainMenu+"submenu").styl e;
submenu.left = calculateSumOffset(menu, 'offsetLeft');
// submenu.top = calculateSumOffset(menu, 'offsetTop') + 30;
submenu.top = menu.style.top+23;
submenu.visibility = fShow;
if (lastMenu != null && lastMenu != submenu) hideAll();

leftX = ie? document.all[idMainMenu+"submenu"].style.posLeft : parseInt(document.getElementById(idMainMenu+"subme nu").style.left);
rightX = ie? leftX + document.all[idMainMenu+"submenu"].offsetWidth : leftX+parseInt(document.getElementById(idMainMenu+ "submenu").offsetWidth);

leftY = ie? document.all[idMainMenu+"submenu"].style.posTop+
document.all[idMainMenu+"submenu"].offsetHeight : parseInt(document.getElementById(idMainMenu+"subme nu").style.top)+parseInt(document.getElementById(i dMainMenu+"submenu").offsetHeight);
rightY = leftY;
}
lastMenu = submenu;
}

function hideAll()
{
if (lastMenu != null) {lastMenu.visibility = fHide;lastMenu.left = 0;}
}

function calculateSumOffset(idItem, offsetName)
{
var totalOffset = 0;
var item = eval('idItem');
do
{
totalOffset += eval('item.'+offsetName);
item = eval('item.offsetParent');
} while (item != null);
return totalOffset;
}

function updateIt(e)
{
if (ie&&!opr6)
{
var x = window.event.clientX;
var y = window.event.clientY;

if (x > rightX || x < leftX) hideAll();
else if (y > rightY) hideAll();
}
if (n||ns6)
{
var x = e.pageX;
var y = e.pageY;

if (x > rightX || x < leftX) hideAll();
else if (y > rightY) hideAll();
}
}

function operahide(){
if (opr6){
if (!MainTable.contains(event.toElement))
hideAll()
}
}

if (ie||ns6)
{
document.body.onclick=hideAll;
document.body.onscroll=hideAll;
document.body.onmousemove=updateIt;
}
if (document.layers)
{
window.captureEvents(Event.MOUSEMOVE);
window.captureEvents(Event.CLICK);
window.onmousemove=updateIt;
window.onclick=hideAll;
}