//------------------------
// Tooltip text functions
//------------------------
// ALTTXT V1.2
// BY: BRIAN GOSSELIN OF SCRIPTASYLUM.COM
// ADDED FADING EFFECT FOR IE4+ AND NS6+ ONLY AND OPTIMIZED THE CODE A BIT.
// SCRIPT FEATURED ON DYNAMIC DRIVE (http://www.dynamicdrive.com) 

// enables fade-in effect for IE4+ and NS6 only
var dofade=false;
// centers the box under the mouse, otherwise displays box to the right of the mouse
var center=false;
// centers the text inside the box. you can't simply do this via style because of NS4.
// otherwise, text is left-justified. 
var centertext=false;

///// NO NEED TO EDIT BEYOND THIS POINT /////

var NS4=(navigator.appName.indexOf("Netscape")>=0 && !document.getElementById) ? true : false;
var IE4=(document.all && !document.getElementById) ? true : false;
var IE5=(document.getElementById && document.all) ? true : false;
var NS6=(document.getElementById && navigator.appName.indexOf("Netscape")>=0 ) ? true: false;
var W3C=(document.getElementById) ? true : false;
var w_y,w_x,navtxt,boxheight,boxwidth;
var ishover=false;
var isloaded=false;
var ieop=0;
var op_id=0;

function getwindowdims() {
  w_y=(NS4||NS6) ? window.innerHeight : (IE5||IE4)? document.body.clientHeight : 0;
  w_x=(NS4||NS6) ? window.innerWidth : (IE5||IE4)? document.body.clientWidth : 0;
}

function getboxwidth() {
  if(NS4) boxwidth=(navtxt.document.width) ? navtxt.document.width : navtxt.clip.width;
  if(IE5||IE4) boxwidth=(navtxt.style.pixelWidth) ? navtxt.style.pixelWidth : navtxt.offsetWidth;
  if(NS6) boxwidth=(navtxt.style.width) ? parseInt(navtxt.style.width) : parseInt(navtxt.offsetWidth);
}

function getboxheight() {
  if(NS4) boxheight=(navtxt.document.height) ? navtxt.document.height : navtxt.clip.height;
  if(IE4||IE5) boxheight=(navtxt.style.pixelHeight) ? navtxt.style.pixelHeight : navtxt.offsetHeight;
  if(NS6) boxheight=parseInt(navtxt.offsetHeight);
}

function movenavtxt(x,y) {
  if(NS4) navtxt.moveTo(x,y);
  if(W3C||IE4) {
    navtxt.style.left=x+'px';
    navtxt.style.top=y+'px';
  }
}

function getpagescrolly() {
  if(NS4||NS6) return window.pageYOffset;
  if(IE5||IE4) return document.body.scrollTop;
}

function getpagescrollx() {
  if(NS4||NS6) return window.pageXOffset;
  if(IE5||IE4) return document.body.scrollLeft;
}

function writeindiv(text) {
  if(NS4) {
    navtxt.document.open();
    navtxt.document.write(text);
    navtxt.document.close();
  }
  if(W3C||IE4) navtxt.innerHTML=text;
}

//**** END UTILITY FUNCTIONS ****//

function writetxt(text) {
  if(isloaded) {
    if(text!=0) {
      ishover=true;
      if(NS4) text='<div class="navtext">'+((centertext)?'<center>':'')+text+((centertext)?'</center>':'')+'</div>';
      writeindiv(text);
      getboxheight();
      if((W3C || IE4) && dofade) {
        ieop=0;
        incropacity();
      }
    }
    else{
      if(NS4) navtxt.visibility="hide";
      if(IE4||W3C) {
        if(dofade) clearTimeout(op_id);
        navtxt.style.visibility="hidden";
      }
      writeindiv('');
      ishover=false;
    }
  }
}

function incropacity() {
  if(ieop<=100) {
    ieop+=7;
    if(IE4 || IE5) navtxt.style.filter="alpha(opacity="+ieop+")";
    if(NS6) navtxt.style.MozOpacity=ieop/100;
    op_id=setTimeout('incropacity()', 50);
  }
}

function moveobj(evt) {
  if(isloaded && ishover){
    margin=(IE4||IE5)? 1 : 23;
    if(NS6) if(document.height+27-window.innerHeight<0)margin=15;
    if(NS4) if(document.height-window.innerHeight<0)margin=10;

    if(NS4) {
      mx=evt.pageX
      my=evt.pageY
    }
    else if(NS6) {
      mx=evt.clientX
      my=evt.clientY
    }
    else if(IE5) {
      mx=event.clientX
      my=event.clientY
    }
    else if(IE4) {
      mx=0
      my=0
    }

    if(NS4) {
      mx-=getpagescrollx();
      my-=getpagescrolly();
    }
    xoff=(center) ? mx-boxwidth/2 : mx+5;
    yoff=(my+boxheight+30-getpagescrolly()+margin>=w_y) ? -15-boxheight: 30;
    movenavtxt(Math.min(w_x-boxwidth-margin,Math.max(2,xoff))+getpagescrollx(),my+yoff+getpagescrolly());
    if(NS4) navtxt.visibility="show";
    if(W3C||IE4) navtxt.style.visibility="visible";
  }
}

if(NS4) document.captureEvents(Event.MOUSEMOVE);
document.onmousemove=moveobj;
window.onload=function() {
  navtxt=(NS4) ? document.layers['navtxt'] : (IE4)? document.all['navtxt'] : (W3C)? document.getElementById('navtxt') : null;
  getboxwidth();
  getboxheight();
  getwindowdims();
  isloaded=true;
  if((W3C || IE4) && centertext) navtxt.style.textAlign="center";
  if(W3C) navtxt.style.padding='4px';
  if(IE4 || IE5 && dofade) navtxt.style.filter="alpha(opacity=0)";
}
window.onresize=getwindowdims;