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Problems running multiple setIntervals at the same time

My first post is here. I want to make a horizontal menu with a submenu sliding down on hover. I know I can use jQuery, but that should practice my javascript skills.

I am using the following code:

var up = new Array()
var down = new Array()
var submenustart

function titleover(headmenu, inter)
{
 submenu = headmenu.lastChild

 up[inter] = window.clearInterval(up[inter])
 down[inter] = window.setInterval("slidedown(submenu)",1)
}

function slidedown(submenu)
{
 if(submenu.offsetTop < submenustart)
 {
  submenu.style.top = submenu.offsetTop + 1 + "px"
 }
}

function titleout(headmenu, inter)
{
 submenu = headmenu.lastChild

 down[inter] = window.clearInterval(down[inter])
 up[inter] = window.setInterval("slideup(submenu)", 1)

}

function slideup(submenu)
{
 if(submenu.offsetTop > submenustart - submenu.clientHeight + 1)
 {
  submenu.style.top = submenu.offsetTop - 1 + "px"
 }
}

The submenustart variable gets the value in another function that is not relevant to my question.
HTML looks like this:

<table class="hoofding" id="hoofding">
 <tr>
  <td onmouseover="titleover(this, 0)" onmouseout="titleout(this, 0)"><a href="#" class="hoofdinglink" id="hoofd1">AAAA</a>

  <table class="menu">
   <tr><td><a href="...">1111</a></td></tr>
   <tr><td><a href="...">2222</a></td></tr>
   <tr><td><a href="...">3333</a></td></tr>
  </table></td>

  <td onmouseover="titleover(this, 1)" onmouseout="titleout(this, 1)"><a href="#" class="hoofdinglink">BBBB</a>

  <table class="menu">
   <tr><td><a href="...">1111</a></td></tr>
   <tr><td><a href="...">2222</a></td></tr>
   <tr><td><a href="...">3333</a></td></tr>
   <tr><td><a href="...">4444</a></td></tr>
   <tr><td><a href="...">5555</a></td></tr>
  </table></td>
        ...
 </tr>
</table>

What happens is this:
If I go over and exit (for ex) menu A, it works fine. If I now go through menu B, then now the interval applied to B is applied to A. Now to B. now 2 interval functions are applied. The first one is for A and the new one caused by hovering over B. If I went to A, all intervals now apply to A.

, .

.

+5
2

-

.

var up   = [],
    down = [],
    submenustart;

function titleover(headmenu, inter) {
    up[inter]   = window.clearInterval(up[inter]);
    down[inter] = window.setInterval(function() { slidedown(headmenu.lastChild); }, 1);
}

function slidedown(submenu) {
    if ( submenu.offsetTop < submenustart  ) {
        submenu.style.top = submenu.offsetTop + 1 + "px";
    }
}

function titleout(headmenu, inter) {
    down[inter] = window.clearInterval(down[inter]);
    up[inter]   = window.setInterval(function() { slideup(headmenu.lastChild); }, 1);
}

function slideup(submenu) {
    if ( submenu.offsetTop > submenustart - submenu.clientHeight + 1 ) {
        submenu.style.top = submenu.offsetTop - 1 + "px";
    }
}

- , . .

<ul class="hoofding" id="hoofding">
    <li onmouseover="titleover(this, 0)" onmouseout="titleout(this, 0)">
        <a href="#" class="hoofdinglink" id="hoofd1">AAAA</a>
        <ul class="menu">
            <li><a href="...">1111</a></li>
            <li><a href="...">2222</a></li>
            <li><a href="...">3333</a></li>
        </ul>
    </li>
    <li onmouseover="titleover(this, 1)" onmouseout="titleout(this, 1)">
        <a href="#" class="hoofdinglink">BBBB</a>
        <ul class="menu">
            <li><a href="...">1111</a></li>
            <li><a href="...">2222</a></li>
            <li><a href="...">3333</a></li>
        </ul>
    </li>
</ul>
+7

AFAIK, ( DOC Gecko) window.clearInterval() , , - .

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