Slide down menu

Følgende er en .js script-fil for en slide-down menu som på http://javascript.internet.com/navigation/slide-down-menu.html

Menuen glider ufatteligt langsomt frem når man trykker på et menupunkt! Nogen der kan gennemskue hvordan hastigheden på slide-effekten kan øges?

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//free JavaScripts on http://www.ScriptBreaker.com

  var height = 20; // height of the menu headers
  var iheight = 15; // height of the menu_items
 
  var bgc = "lightyellow" // background color of the item
  var tc = "black" // text color of the item
 
  var over_bgc = "silver";
  var over_tc = "black";
 
  var speed = 0;
  var timerID = "";
  var N = (document.all) ? 0 : 1;
  var width = 152
 


  var self_menu = new Array();
function write_menu()
{
  smc = 0; // count the position of the self_menu
  document.write("<div style='position:absolute'>");
  mn = 0;
  mni = 1;
  start = -1;
 
  for(i=0;i<Link.length;i++)
  {
  la = Link[i].split("|");

  if (la[0] == "0")
  {
    if(start == 0)
    {
      document.write("</div>");
      h =  csmc * iheight;
      tmn = mn; //-h
      self_menu[smc] = new Array(tmn,h,0,-2);
      smc++;
      mn--;
    }
    csmc = 0;
    document.write("<div class='menu' style='top:"+mn+";height:"+height+"' id='down"+smc+"' onclick='pull_down("+smc+","+mni+")'>&nbsp;"+ la[1] + "</div>");
    self_menu[smc] = new Array(mn,height,0,mni);
    smc++;
    mni++;
    mn+=height;
    start = 1;
  }
  else
  {
    if(start == 1)
    {
      if(N)mn+=2;
      document.write("<div class='item_panel' id='down"+smc+"' style='top:"+mn+"'>");
      start = 0;
    }
   
    document.write("<a href='"+la[2]+"'");
    if (la[3] != "") document.write(" target='" + la[3] + "' ");
    document.write("><div class='item' id='d"+i+"' style='height:"+iheight);
    if (N) document.write(";width:150");
    document.write("' onmouseover='color(this.id)' onmouseout='uncolor(this.id)'>&nbsp;&nbsp;"+ la[1] + "</div></a>");
    csmc++;
  }
  }
  if (start == 0)
  {
    document.write("</div>");
    h =  csmc * iheight;
    tmn = mn + 5; //-h
    self_menu[smc] = new Array(tmn,h,0);
    name = "down" + (self_menu.length-1);
    obj = document.getElementById(name);
    obj.style.borderBottomColor = "darkblue";
    obj.style.borderBottomWidth = 1;
    obj.style.borderBottomStyle = "solid";
  }
  document.write("</div>");
}
 

function color(obj)
{
document.getElementById(obj).style.backgroundColor = over_bgc;
document.getElementById(obj).style.color = over_tc
}

function uncolor(obj)
{
document.getElementById(obj).style.backgroundColor = bgc;
document.getElementById(obj).style.color = tc
}

function pull_down(nr,c)
{
if (timerID == "")
{
to = self_menu[nr+1][1]
begin = nr + 2;
if (timerID != "") clearTimeout(timerID);
if (self_menu[nr+1][2] == 0)
{
  self_menu[nr+1][2] = 1;
  if(nr == self_menu.length-2) {to++;}
  epull_down(begin,to,0);
}
else
{
  to = 0;
  self_menu[nr+1][2] = 0;
  name = "down"+(nr+2);
  open_item = 0;
  for(i=0;i<nr;i++)
  {
  if(self_menu[i][2] == 1)
    {open_item += self_menu[i][1];
    }
  }
  if (N == false) {open_item-= (c*1)};
  if (nr== self_menu.length-2) {val = self_menu[self_menu.length-1][1];to=-1;}
  else  val = parseInt(document.getElementById(name).style.top) -(open_item)-(c*height);
  epull_up(begin,to,val);
}
}
}

function epull_down(nr,to,nowv)
{
name = "down" + (nr-1);
obj = document.getElementById(name).style.clip = "rect(0,"+width+","+(nowv+1)+",0)";
for (i=nr;i<self_menu.length;i++)
{
  name = "down" + i;
  obj = document.getElementById(name);
  obj.style.top = parseInt(obj.style.top)+1;
}
nowv++;
if(nowv < to) timerID = setTimeout("epull_down("+nr+","+to+","+nowv+")",speed);
else timerID = "";
}

function epull_up(nr,to,nowv)
{
name = "down" + (nr-1);
obj = document.getElementById(name).style.clip = "rect(0,"+width+","+nowv+",0)";
for (i=nr;i<self_menu.length;i++)
{
  name = "down" + i;
  obj = document.getElementById(name);
  obj.style.top = parseInt(obj.style.top)-1;
}
nowv--;
if(nowv > to) timerID = setTimeout("epull_up("+nr+","+to+","+nowv+")",speed);
else timerID = "";
}

function startup(nr)
{
write_menu();
if (nr != 0)
{
for(i=0;i<self_menu.length;i++)
{
  if(self_menu[i][3] == nr) pull_down(i,nr)
  i==self_menu.length;
}
}
} 

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På forhånd tak :)