function tooltip(){}

tooltip.id="tooltip";
tooltip.offsetx = 0;
tooltip.offsety = 20;
tooltip.x = 0;
tooltip.y = 0;
tooltip.snow = 0;
tooltip.tooltipElement=null;
tooltip.title_saved='';
tooltip.saveonmouseover=null;
tooltip.ie4 = (document.all)? true:false;
tooltip.ie5 = false;
if(tooltip.ie4) tooltip.ie5 = (navigator.userAgent.indexOf('MSIE 5')>0 || navigator.userAgent.indexOf('MSIE 6')>0);
tooltip.dom2 = ((document.getElementById) && !(tooltip.ie4||tooltip.ie5))? true:false; // check the W3C DOM level2 compliance. ie4, ie5, ns4 are not dom level2 compliance !! grrrr >:-(



tooltip.show = function (htmlelement) {

   if ( this.ie4 || this.dom2 ) {

      text=htmlelement.getAttribute("title");
      this.title_saved=text;
      htmlelement.setAttribute("title","");
   }
        if(this.dom2){
                this.tooltipElement = document.getElementById(this.id);
      this.saveonmouseover=document.onmousemove;
                document.onmousemove = this.mouseMove;
        }else if ( this.ie4 ) {
      this.tooltipElement = document.all[this.id].style;
      this.saveonmouseover=document.onmousemove;
      document.onmousemove = this.mouseMove;
        }

   if ( this.ie4 || this.dom2 ) {
      if(this.ie4) document.all[this.id].innerHTML = text;
      else if(this.dom2) document.getElementById(this.id).innerHTML=text;

      this.moveTo(this.x + this.offsetx , this.y + this.offsety);

      if(this.ie4) this.tooltipElement.visibility = "visible";
      else if(this.dom2) this.tooltipElement.style.visibility ="visible";
   }
   return false;
}


tooltip.hide = function (htmlelement) {
        if ( this.ie4 || this.dom2 ) {
      htmlelement.setAttribute("title",this.title_saved);
      this.title_saved="";

                if(this.ie4) this.tooltipElement.visibility = "hidden";
      else if(this.dom2) this.tooltipElement.style.visibility = "hidden";

      document.onmousemove=this.saveonmouseover;
        }
}




tooltip.mouseMove = function (e) {
   // we don't use "this", but tooltip because this method is assign to an event of document
   // and so is dreferenced

   if(tooltip.ie4 || tooltip.dom2){

      if(tooltip.dom2){
         tooltip.x = e.pageX;
         tooltip.y = e.pageY;
      }else{
         if(tooltip.ie4) { tooltip.x = event.x; tooltip.y = event.y; }
         if(tooltip.ie5) { tooltip.x = event.x + document.body.scrollLeft;
               tooltip.y = event.y + document.body.scrollTop; }
      }
      tooltip.moveTo( tooltip.x +tooltip.offsetx , tooltip.y + tooltip.offsety);
   }
}

// Move the tooltip element
tooltip.moveTo = function (xL,yL) {
        if(this.dom2){
                this.tooltipElement.style.left = xL +"px";
      this.tooltipElement.style.top = yL +"px";
        }else if(this.ie4){
      this.tooltipElement.left = xL;
      this.tooltipElement.top = yL;
   }
}