Install the following script as dropDownMenu.js in document root Normally this will be done automatically when the components of the content manager are activated.

var menu=function(){
        var t=1,z=50,s=6,a;
        function dd(n){this.n=n; this.h=[]; this.c=[]}
        dd.prototype.init=function(p,c){
                a=c; var w=document.getElementById(p), s=w.getElementsByTagName('ul'), l=s.length, i=0;
                for(i;i=c.mh&&f==1)){
                        if(f==1){c.style.filter=''; c.style.opacity=1; c.style.overflow='visible'}
                        clearInterval(c.t); return
                }
                var d=(f==1)?Math.ceil((c.mh-h)/s):Math.ceil(h/s), o=h/c.mh;
                c.style.opacity=o; c.style.filter='alpha(opacity='+(o*100)+')';
                c.style.height=h+(d*f)+'px'
        }
        return{dd:dd}
}();