Drop down Menu’s not working

Hello,

Thank you for your so useful plugin.
I put it for my client and when it will work i will try to convince him to upgrade for the pro version.

I am not webmaster or developper but graphic designer and my client ask me to translate his html website to wordpress. I used HTML5 Blank to have the same design and using a tutorial i did it. Everything looks good except the flags of langage menu wich not drop down.

I already tried lots of things that doesn’t working.
I don’t want to use other menu plugin because it isn’t the same style.

I am sure its only write a little css code but i don’t know which.

Here is my footer code :

<!-- nav -->
<div id="cssmenu">
<?php html5blank_nav(); ?>     							                        
</div>
<!-- /nav -->

Here is my css code :

/*====NAVIGATION
=======================================================*/

#cssmenu {
float: right;
margin-top: 35px;
position: relative;
z-index: 1200;
}

#cssmenu li {
display: block;
float: left;
position: relative;
margin-left:5px;
background-color: #121212;
border-top-right-radius: 8px;
border-bottom-left-radius: 8px;
-webkit-transition: background-color .2s linear;
-moz-transition: background-color .2s linear;
-o-transition: background-color .2s linear;
-ms-transition: background-color .2s linear;
transition: background-color .2s linear;
}

#cssmenu li:hover {
background-color: #000;
text-shadow: none;
}

#cssmenu li a {
font-family: Bebas, Arial, sans-serif;
font-size: 18px;
color: #f7f7f7;
text-decoration: none;
padding: 10px;
display: inline-block;
margin-bottom: 0px;
}

#cssmenu li a span {
font-family: Arial, sans-serif;
text-transform: uppercase;
font-size: 9px;
display: block;
line-height: 14px;
}

#cssmenu li .active-nav, #cssmenu li .active-nav:hover {
background-color: #121212;
text-shadow: 1px 1px 0px #333;
border-top-right-radius: 8px;
border-bottom-left-radius: 8px;
}

#cssmenu li.dropdown {
border-bottom-left-radius: 0;
}

#cssmenu li.dropdown .active-nav {
border-bottom-left-radius: 0;
}

/*====DROPDOWN NAV STYLING
=======================================================*/

#navigation ul {
position: absolute;
top: -999em;
width: 160px; /* left offset of submenus need to match (see below) */
background: #121212;
margin-top: 24px;
}

#navigation ul li {
width: 100%;
margin-left: 0;
}

#navigation li:hover {
visibility: inherit; /* fixes IE7 ‘sticky bug’ */
}

#navigation a {
position: relative;
}

#navigation li:hover ul,
#navigation li.sfHover ul {
left: 0;
top: 1.4em; /* match top ul list item height */
z-index: 99;
}

ul#navigation li:hover li ul,
ul#navigation li.sfHover li ul {
top: -999em;
margin-top: 0;
}

ul#navigation li li:hover ul,
ul#navigation li li.sfHover ul {
left: 160px; /* match ul width */
top: 0;
}

ul#navigation li li:hover li ul,
ul#navigation li li.sfHover li ul {
top: -999em;
}

ul#navigation li li li:hover ul,
ul#navigation li li li.sfHover ul {
left: 160px; /* match ul width */
top: 0;
}

#navigation ul li a {
color: #f7f7f7;
font-size: 16px;
margin-left: 0;
padding: 10px 15px;
border-radius: 0;
width: 130px;
-webkit-transition: background-color .2s ease-out;
-moz-transition: background-color .2s ease-out;
-o-transition: background-color .2s ease-out;
-ms-transition: background-color .2s ease-out;
transition: background-color .2s ease-out;
}

#navigation ul li a:hover {
background-color: #dc3f35;
text-shadow: 1px 1px 0px #333;
}

Here is my function code :

// HTML5 Blank navigation
function html5blank_nav()
{
wp_nav_menu(
array(
‘theme_location’ => ‘header-menu’,
‘menu’ => ”,
‘container’ => ‘div’,
‘container_class’ => ‘menu-{menu slug}-container’,
‘container_id’ => ”,
‘menu_class’ => ‘menu’,
‘menu_id’ => ”,
‘echo’ => true,
‘fallback_cb’ => ‘wp_page_menu’,
‘before’ => ”,
‘after’ => ”,
‘link_before’ => ”,
‘link_after’ => ”,
‘items_wrap’ => ‘

%3$s

‘,
‘depth’ => 0,
‘walker’ => ”
)
);
}

THANK YOU SO MUCH FOR YOUR HELP

Virginie