/**
 *
 * Can show a tooltip over an element
 * Content of tooltip is the title attribute value of the element
 * copyright 2004 Laurent Jouanneau. http://ljouanneau.com/soft/javascript
 * release under LGPL Licence
 * works with dom2 compliance browser, and IE6. perhaps IE5 or IE4.. not Nestcape 4
 *
 * To use it :
 * 1.include this script on your page
 * 2.insert this element somewhere in your page
 *       <div id="tooltip"></div>
 * 3. style it in your CSS stylesheet (set color, background etc..). You must set
 * this two style too :
 *     div#tooltip { position:absolute; visibility:hidden; ... }
 * 4.the end. test it ! :-)
 *
 */


// create the tooltip object
function tooltip(){}

// setup properties of tooltip object
tooltip.id="tooltip";
tooltip.offsetx = 10;
tooltip.offsety = 10;
tooltip.x = 0;
tooltip.y = 0;
tooltip.snow = 0;
tooltip.tooltipElement=null;
tooltip.title_saved='';
tooltip.saveonmouseover=null;
tooltip.ie4 = (document.all)? true:false;   // check if ie4
tooltip.ie5 = false;
if(tooltip.ie4) tooltip.ie5 = (navigator.userAgent.indexOf('MSIE 5')>0 || navigator.userAgent.indexOf('MSIE 6')>0 || navigator.userAgent.indexOf('MSIE 7')>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 >:-(


/**
* Open Tooltip. The title attribute of the htmlelement is the text of the tooltip
* Call this method on the mouseover event on your htmlelement
* ex :  <div id="myHtmlElement" onmouseover="tooltip.show(this)"...></div>
*/
tooltip.show = function (htmlelement) {

   if(document.blockPopUp && document.blockPopUp()) return;
   
   if ( this.ie4 || this.dom2 ) {
      // we save text of title attribute to avoid the showing of tooltip generated by browser
      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.display = "block";
      else if(this.dom2) this.tooltipElement.style.display ="block";
   }
   return false;
}

/**
* hide tooltip
* call this method on the mouseout event of the html element
* ex : <div id="myHtmlElement" ... onmouseout="tooltip.hide(this)"></div>
*/
tooltip.hide = function (htmlelement) {
    if(document.blockPopUp && document.blockPopUp()) return;
  if ( this.ie4 || this.dom2 ) {
      htmlelement.setAttribute("title",this.title_saved);
      this.title_saved="";

    if(this.ie4) this.tooltipElement.display = "none";
      else if(this.dom2) this.tooltipElement.style.display = "none";

      document.onmousemove=this.saveonmouseover;
  }
}



// Moves the tooltip element
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; }
      }
      if(document.AfficheZone) {
        pxToXpos(tooltip.x);
        pxToYpos(tooltip.y);
        writit(afficheXpos(Xpos)+" "+afficheYpos(Ypos), "pos");
      }
      
      tooltip.moveTo( tooltip.x +tooltip.offsetx , tooltip.y + tooltip.offsety);
   }
}

// Move the tooltip element
tooltip.moveTo = function (xL,yL) {
    var realX = xL;
    var realY = yL;
    if(xL > this.tooltipElement.offsetWidth+20) realX = xL - (this.tooltipElement.offsetWidth || 200)-20;
    if(yL > this.tooltipElement.offsetHeight+20) realY = yL - (this.tooltipElement.offsetHeight || 0)-20;
  if(this.dom2) {
    this.tooltipElement.style.left = realX +"px";
        this.tooltipElement.style.top = realY +"px";
    } else if(this.ie4){
        this.tooltipElement.left = realX;
        this.tooltipElement.top = realY;
    }
}