/* jseyes.js
  
  The classic Xeyes in JavaScript
  (c) PROPIX Ltd,  Written by Pintér Gábor
  Székesfehérvár, Kriványi u. 15.
  H-8000, HUNGARY
  Tel: +36 30 3489752
  Fax: +36 22 304326
  Email: propix@freemail.hu
  Web: http://www.propix.hu
  
  Revisions:
    V1.0  10/14/2001  Original release
  
  Usage:
    1. Include this file from the head of your page
    2. Define parameters or accept the defaults
    3. Insert the image
  
  This script requires Internet Explorer 5+ or Nescape Navigator 6+! In other browsers it does nothing.
  
  1. Include jseyes.js from the head of your page
  Insert the following line into the head of your page:
    <script src="jseyes.js"></script>
  
  2. Define parameters
  You can accept the defaults or assign new values to these variables:
  
  jseyesimg="jseyes.gif"
    The main image. Please do not edit.
  
  jseyeimg="jseyeblue.gif"
    The image of the eye. Must be a 21x29 solid ellipse with transparent background.
  
  4. Insert the image
  Call jseyes() where you want to see the image:
    <script>
      jseyes();
    </script>
  
  Or call jseyes(x, y) to show the image at absolute position:
    <script>
      jseyes(100,100);
    </script>
  
  Example: http://www.propix.hu/www/jseyes/jseyes.html
  
  */
  
  
  
  
  // Defaults
  var jseyesimg="graphic-javascript-effect-eyes-jseyes.gif";
  var jseyeimg="graphic-javascript-effect-eyes-jseyeblue.gif";
  var jseyeslink="http://www.wsabstract.com";
  
  // Internal
  var jseyeso=null, jseye1=null, jseye2=null;
  
  // Browser detection
  
  // Global variables
  var browserversion=0.0;
  var browsertype=0; // 0: unknown; 1:MSIE; 2:NN
  
  // Return true if MSIE or NN detected
  function browserdetect() {
    var agt= navigator.userAgent.toLowerCase();
    var appVer= navigator.appVersion.toLowerCase();
    browserversion= parseFloat(appVer);
    var iePos= appVer.indexOf('msie');
    if (iePos!=-1) browserversion= parseFloat(appVer.substring(iePos+5, appVer.indexOf(';',iePos)));
    var nav6Pos = agt.indexOf('netscape6');
    if (nav6Pos!=-1) browserversion= parseFloat(agt.substring(nav6Pos+10))
    browsertype= (iePos!=-1) ? 1 : (agt.indexOf('mozilla')!=-1) ? 2 : 0;
    return(browsertype>0);
  }
  
  browserdetect();
  
  // General utils
  
  // Find object by name or id
  function jseyesobj(id) {
    var i, x;
    x= document[id];
    if (!x && document.all) x= document.all[id];
    for (i=0; !x && i<document.forms.length; i++) x= document.forms[i][id];
    if (!x && document.getElementById) x= document.getElementById(id);
    return(x);
  }
  
  // Move eyes
  function jseyesmove(x, y) {
    var ex, ey, dx, dy;
    if (jseyeso && jseye1 && jseye2 && jseyeso.style) {
      ex=jseyeso.offsetLeft+46; ey=jseyeso.offsetTop+58;
      dx=x-ex; dy=y-ey;
      r=(dx*dx/49+dy*dy/289<1) ? 1 : Math.sqrt(49*289/(dx*dx*289+dy*dy*49));
      jseye1.style.left= r*dx+36.5; jseye1.style.top= r*dy+44;
      ex+=56; dx-=56;
      r=(dx*dx/49+dy*dy/289<1) ? 1 : Math.sqrt(49*289/(dx*dx*289+dy*dy*49));
      jseye2.style.left= r*dx+92.5; jseye2.style.top= r*dy+44;
    }
  }
  
  // Main
  function jseyes() {
    var img;
    var x, y, a=false;
  
    if (arguments.length==2) {
      x= arguments[0];
      y= arguments[1];
      a= true;
    }
  
    if (browsertype>0 && browserversion>=5) {
      img= "<div id='jseyeslayer' style='position:"+
             (a ? "absolute; left:"+x+"; top:"+y : "relative")+
             "; z-index:5; width:150; height:150 overflow:hidden'>"+
               "<div id='jseye1' style='position:absolute; left:36; top:44; z-index:6; width:21; height:29'>"+
                 "<img src='"+jseyeimg+"' width=21 height=29 onClick=\"location.href='"+jseyeslink+"'\">"+
               "</div>"+
               "<div id='jseye2' style='position:absolute; left:92; top:44; z-index:6; width:21; height:29'>"+
                 "<img src='"+jseyeimg+"' width=21 height=29 onClick=\"location.href='"+jseyeslink+"'\">"+
               "</div>"+
               "<img src='"+jseyesimg+"' width=150 height=150 onClick=\"location.href='"+jseyeslink+"'\">"+
           "</div>";
      document.write(img);
      jseyeso=jseyesobj('jseyeslayer');
      jseye1=jseyesobj('jseye1');
      jseye2=jseyesobj('jseye2');
  
      switch (browsertype) {
        case 1:
          document.onmousemove=jseyesmousemoveIE;
          break;
        case 2:
          document.captureEvents(Event.MOUSEMOVE);
          document.onmousemove=jseyesmousemoveNS;
          break;
      }
    }
  }
  
  // Mouse move events
  function jseyesmousemoveNS(e) {
    jseyesmove(e.pageX, e.pageY);
    //return(false);
  }
  function jseyesmousemoveIE() {
    jseyesmove(event.clientX+document.body.scrollLeft, event.clientY+document.body.scrollTop);
    //return(false);
  }