Jquery menu superfish

Bonjour,

Je travaille sur une application web et j'ai utilisé un menu jquery superfish; il marche bien, mais il a un problème; quand le second niveau contient bcp d'éléments, les éléments descendants se cachent derrière le footer.

voici le code css du footer

/*************************************/
/* Footer */

#footer {
height: 50px;
margin: 0 auto;
padding: 0px 0 15px 0;
background: #F8F8F8;
border-top: 5px solid #E7DFD7;
font-family: 'Arvo', serif;
}

#footer p {
margin: 0;
padding-top: 20px;
line-height: normal;
font-size: 12px;
letter-spacing: 2px;
text-transform: uppercase;
text-align: center;
color: #A0A0A0;
}


/************************/

et voici le code css du menu superfish

/*************************************/

.sf-menu, .sf-menu * {
margin: 0;
padding: 0;
list-style: none;
}
.sf-menu li {
position: relative;
}
.sf-menu ul {
position: absolute;
display: none;
top: 100%;
left: 0;
z-index: 99;
}
.sf-menu > li {
float: left;
}
.sf-menu li:hover > ul,
.sf-menu li.sfHover > ul {
display: block;
}

.sf-menu a {
display: block;
position: relative;
}
.sf-menu ul ul {
top: 0;
left: 100%;
}


/*** DEMO SKIN ***/
.sf-menu {
float: left;
margin-bottom: 1em;
}
.sf-menu ul {
box-shadow: 2px 2px 6px rgba(0,0,0,.2);
min-width: 12em; /* allow long menu items to determine submenu width */
*width: 12em; /* no auto sub width for IE7, see white-space comment below */
}
.sf-menu a {
border-left: 1px solid #fff;
border-top: 1px solid #dFeEFF; /* fallback colour must use full shorthand */
border-top: 1px solid rgba(255,255,255,.5);
padding: 0.4em 1em;
text-decoration: none;
zoom: 1; /* IE7 */
}
.sf-menu a {
color: #FFF /* #13a*/;
font-size:14px;
}
.sf-menu li {
background: #65A9D7/* #BDD2FF*/;
white-space: nowrap; /* no need for Supersubs plugin */
*white-space: normal; /* ...unless you support IE7 (let it wrap) */
-webkit-transition: background .2s;
transition: background .2s;
}
.sf-menu ul li {
background: #65A9D7/* #AABDE6*/;
}
.sf-menu ul ul li {
background: #9AAEDB;
}
.sf-menu li:hover,
.sf-menu li.sfHover {
background: #155882/* #CFDEFF*/;
/* only transition out, not in */
-webkit-transition: none;
transition: none;
}

/*** arrows (for all except IE7) **/
.sf-arrows .sf-with-ul {
padding-right: 2.5em;
*padding-right: 1em; /* no CSS arrows for IE7 (lack pseudo-elements) */
}
/* styling for both css and generated arrows */
.sf-arrows .sf-with-ul:after {
content: '';
position: absolute;
top: 50%;
right: 1em;
margin-top: -3px;
height: 0;
width: 0;
/* order of following 3 rules important for fallbacks to work */
border: 5px solid transparent;
border-top-color: #dFeEFF; /* edit this to suit design (no rgba in IE8) */
border-top-color: rgba(255,255,255,.5);
}
.sf-arrows > li > .sf-with-ul:focus:after,
.sf-arrows > li:hover > .sf-with-ul:after,
.sf-arrows > .sfHover > .sf-with-ul:after {
border-top-color: white; /* IE8 fallback colour */
}
/* styling for right-facing arrows */
.sf-arrows ul .sf-with-ul:after {
margin-top: -5px;
margin-right: -3px;
border-color: transparent;
border-left-color: #dFeEFF; /* edit this to suit design (no rgba in IE8) */
border-left-color: rgba(255,255,255,.5);
}
.sf-arrows ul li > .sf-with-ul:focus:after,
.sf-arrows ul li:hover > .sf-with-ul:after,
.sf-arrows ul .sfHover > .sf-with-ul:after {
border-left-color: white;
}
/********************************************/