isDOM=document.getElementById
isMSIE=document.all && document.all.item
isNetscape4=document.layers
isOpera=window.opera
isOpera5=isOpera && isDOM
isMSIE5=isDOM && isMSIE && !isOpera
isMozilla=isNetscape6=isDOM && !isMSIE && !isOpera
var obj;
function getLayer(layerName, parentLayerName){
  if(isDOM){ return document.getElementById(layerName); }
  if(isMSIE){ return document.all[layerName]; }
  if(isNetscape4){ return eval('document.layers[layerName]'); }
  return false;
}
function t_show(e,what){
  mousex = e.clientX;
  mousey = e.clientY;
  pagexoff = 0;
  pageyoff = 0;
  if(isMSIE5){
    pagexoff = document.body.scrollLeft;
    pageyoff = document.body.scrollTop;
  }
  else{
    pagexoff = window.pageXOffset;
     pageyoff = window.pageYOffset;
  }
  if(getLayer(what)){
    if(isNetscape4)
      obj = getLayer(what);
    else
      obj = getLayer(what).style;

          if(obj){
            leftoff = mousex-pagexoff;
            obj.left = (mousex+pagexoff-160);

            topoff = mousey-pageyoff;
            if(isOpera && topoff <= 30)
              obj.top = mousey + 20;
            else
                if( mousey <= 30)
                obj.top = (mousey+pageyoff) + 20;
                else
              if (isOpera)
                obj.top = mousey + 20;
            else
              obj.top = (mousey+pageyoff) + 20;


            if(isNetscape4)
              obj.visibility = 'show';
            else
              obj.visibility = 'visible';
          }
   }
  return true;
}
function t_hide(){
  if(obj){
    if(isNetscape4)
      obj.visibility = 'hide';
    else
      obj.visibility='hidden';
  }
  return true
}