Dream-perturbing doubts with my drop down menu - html

Question

I tried to do a dropdown menu, but I have a lot of questions and it seems I am doing all wrong. Some of the major question that are perturbing my dreams are:
Should I use list-style:none; on ULs or LIs (or both)?
Is it better to put background-color and border on As or LIs?
Should the LIs that are inside the absolute floating UL have
float:left; or position:relative;?
The code I am using seems of work, but my biggest fear is that I am writing unnecessary lines or even bad coding.
Please help.
The CSS I am using:
*{
padding:0;
margin:0;
}
#menu{
margin:0 auto;
width:800px;
background:#999;
border:1px solid #777;
}
#menu ul{
list-style:none;
border-right:1px solid #aeaeae;
/*Not sure about this V*/
position:relative;
float:left;
}
#menu li ul{
font-weight:normal;
display:none;
position:absolute;
border:1px solid #777;
width:200px;
/*Not sure about this V*/
float:none;
margin-left:-2px;
}
#menu li{
display:block;
position:relative;
float:left;
background:#999;
border-right:1px solid #777;
border-left:1px solid #aeaeae;
}
#menu li li{
float:none;
background:#eaeaea;
border:0;
border-top:1px solid #666;
}
#menu li:hover{
background:#a6a6a6;
}
#menu li li:hover{
background:#f5f5f5;
}
#menu a{
display:block;
text-decoration:none;
color:#fff;
padding:5px 15px;
}
#menu li ul a{
color:#333;
}
#menu a:hover{
color:#fff;
}
#menu li ul a:hover{
color:red;
}
#menu li li:first-child{
border-top:0;
}
.clear{
clear:both;
font-size:0;
line-height:0;
}
The HTML structure is:
<div id="menu">
<ul>
<li>Home</li>
<li>About Us</li>
<li>Products
<li>Drop Down
<ul>
<li>DD Item</li>
<li>Another One</li>
<li>Last DD Item</li>
</ul><div class="clear"></div>
</li>
</ul><div class="clear"></div>
</div>
I am using JQuery to show/hide the menu with:
$('#menu ul li').hover(function(){$('ul',this).slideDown(100);},
function(){$('ul',this).slideUp(100);});
The code I used is strongly modified, but taken from here

Answer 1

Your dreams are probably safe. That is, your CSS looks pretty good overall. You may want to consider using Twitter Bootstrap for some of what you're doing (awesome drop-downs), but you can certainly roll-your-own.
To answer your questions:
Should I use list-style:none; on ULs or LIs (or both)?
Just on ul's.
Is it better to put background-color and border on As or LIs?
Put them on the li elements.
Should the LIs that are inside the absolute floating UL have float:left; or position:relative;?
These accomplish entirely different things. Floating left should be sufficient, but you may want to do both.
You should also refactor your jQuery code, despite the fact that it works:
$("#menu ul li").hover(
function () {
$(this).children("ul").slideDown(100);
},
function () {
$(this).children("ul").slideUp(100);
}
);