Скорость выдвежного меню

t type="text/javascript">
      <!--
      var timeout         = 500;
      var closetimer	  = 0;
      var ddmenuitem      = 0;
// open hidden layer
      function mopen(id)
      { 
      // cancel close timer
      mcancelclosetime();
 // close old layer
      if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
 // get new layer and show it
      ddmenuitem = document.getElementById(id);
      ddmenuitem.style.visibility = 'visible';   
}
      // close showed layer
      function mclose()
      {
      if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
      }
 // go close timer
      function mclosetime()
      {
      closetimer = window.setTimeout(mclose, timeout);
      }
 // cancel close timer
      function mcancelclosetime()
      {
      if(closetimer)
      {
      window.clearTimeout(closetimer);
      closetimer = null;
      }
      }
 
 // close layer when click-out
      document.onclick = mclose; 
      // -->
      </script> 

<ul id="sddm">
	<li><a href="/" onmouseover="mopen('m1')" onmouseout="mclosetime()">Меню</a>
		<div id="m1" onmouseover="mcancelclosetime()" onmouseout="mclosetime()">
		<a href="#">HTML DropDown</a>
		<a href="#">DHTML DropDown menu</a>
		<a href="#">JavaScript DropDown</a>
		<a href="#">DropDown Menu</a>
		<a href="#">CSS DropDown</a>
		</div>
	</li>
</ul>