trouble with addEventListener

im making a simple dropdown menu prototype class, and i have it posted here
[url]http://www.creatrixcordis.com/help/help.html[/url]

it work fine in IE 6 but for firefox i have problems with it, i ran it trough Venkmanns debugger and i got no error, it seem like this line

this._Button.ownerDocument.addEventListener(‘click’,this.showhideSubMenu,false);

runs fine and this.showhideSubMenu has a value

but when it comes time to run the function when i click the menuitem ,nothing happens it doesnt reach the function

could it be a scope issue

the function where this happens is here

MenuItem.prototype.registerWithMainOnClick = function()
{
var instance = this;

this.showhideSubMenu = function(eventVar)
{
if(eventVar.srcElement == instance._Button || eventVar.srcElement.parentElement == instance._Button)
{
instance._Button.onclick();

if(instance._MenuItems.parentElement.style.display == “block”)
{
instance._MenuItems.parentElement.style.display = “none”;
instance._MenuItems.parentElement.style.visibility = “hidden”;
}
else
{
instance._MenuItems.parentElement.style.display = “block”;
instance._MenuItems.parentElement.style.visibility = “visible”;
}
}
else
{
instance._MenuItems.parentElement.style.display = “none”;
instance._MenuItems.parentElement.style.visibility = “hidden”;
}
}

if(this._Button.ownerDocument.attachEvent)
{

this._Button.ownerDocument.attachEvent(‘onclick’,this.showhideSubMenu);
}
else
{
this._Button.ownerDocument.addEventListener(‘click’,this.showhideSubMenu,false);
}

}

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