var dir = "in";
var step = 1;
var ttop = 305;
var leftgate_width = 184;
var midpos = 225;
var max_open = 160;
var dis_open = -leftgate_width+1;
var time = 0;
var ti = 10;
var btype;

// establish which browser type
btype = "";
if(document.getElementById) btype = "DOM";
else
{
   if(parseInt(navigator.appVersion) == 4)
   {
      if(navigator.appName == "Netscape") btype = "NN4";
      if(navigator.appName == "Microsoft Internet Explorer") btype = "IE4";
   }
}

// gates initial position
lg = midpos + dis_open;
s=" style=\"position:absolute; left:"+lg+"px; top:"+ttop+"px; z-index:8;\"";
src=" src=\"../images/left.jpg\"";
document.write("<img id=\"leftgate\""+s+src+">");

rg = midpos + dis_open + leftgate_width;
s=" style=\"position:absolute; left:"+rg+"px; top:"+ttop+"px; z-index:8;\"";
src=" src=\"../images/right.jpg\"";
document.write("<img id=\"rightgate\""+s+src+">");

if(btype != "") window.setTimeout("slide(btype)",ti);

function slide(btype) 
{
   time = ti;
   if(dir == "in")
   {
      dis_open = dis_open - step;
      tt = dis_open + leftgate_width;
      if(tt == 0) 
      {
         dir = "out";
         time = 1000;
         if(btype == "DOM")
         {
            objm = document.getElementById("slidemsg");
            objm.style.visibility = "visible";
         }
         else if(btype == "IE4")
         {
            document.all.slidemsg.style.visibility = "visible";
         }
         else if(btype == "NN4")
         {
            document.slidemsg.visibility = "visible";
         }
      }
   }
   else if(dir == "out")
   {
      dis_open = dis_open + step;
      if(dis_open == max_open) dir = "stop";
   }
   else return(true); // stop
   lpos = midpos + dis_open - 1;
   rpos = lpos + leftgate_width;
   if(btype == "DOM")
   {
      objl = document.getElementById("leftgate");
      objl.style.left = lpos+"px";
      objr = document.getElementById("rightgate");
      objr.style.left = rpos+"px";
   }
   else if(btype == "IE4")
   {
      document.all.leftgate.style.left = lpos+"px";
      document.all.rightgate.style.left = rpos+"px";
   }
   else if(btype == "NN4")
   {
      document.leftgate.left = lpos+"px";
      document.rightgate.left = rpos+"px";
   }
   window.setTimeout("slide(btype)",time);
}