var offsetfrommouse=[15,15]; //image x,y offsets from cursor position in pixels. Enter 0,0 for no offset
var displayduration=0; //duration in seconds image should remain visible. 0 for always.
var currentimageheight = 270; // maximum image size.

if (document.getElementById || document.all){
  document.write('<div id="trailimage">');
  document.write('</div>');
}

function gettrailobj(){
  if (document.getElementById)
    return document.getElementById("trailimage").style
  else if (document.all)
    return document.all.trailimagid.style
}

function gettrailobjnostyle(){
  if (document.getElementById)
    return document.getElementById("trailimage")
  else if (document.all)
    return document.all.trailimagid
}


function truebody(){
  return (!window.opera && document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}

function showtrail(imagename,name,sku,colour){

  document.onmousemove=followmouse;

  /*
  newHTML = '<div class="trail-name">'+name+'</div>';
  newHTML += '<div class="trail-sku">' + sku + '</div><div class="trail-colour">'+colour+'</div>';
  newHTML += '<div class="trail-image"><img src="' + imagename + '"></div>';
  */
  newHTML = '<img src="' + imagename + '">';
  gettrailobjnostyle().innerHTML = newHTML;
  gettrailobj().visibility="visible";
}


function hidetrail(){
  gettrailobj().visibility="hidden";
  document.onmousemove="";
  gettrailobj().left="-500px";
}

function followmouse(e){

  var xcoord=offsetfrommouse[0]
  var ycoord=offsetfrommouse[1]

  var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15
  var docheight=document.all? Math.min(truebody().scrollHeight, truebody().clientHeight) : Math.min(document.body.offsetHeight, window.innerHeight)

  //if (document.all){
  //  gettrailobjnostyle().innerHTML = 'A = ' + truebody().scrollHeight + '<br>B = ' + truebody().clientHeight;
  //} else {
  //  gettrailobjnostyle().innerHTML = 'C = ' + document.body.offsetHeight + '<br>D = ' + window.innerHeight;
  //}

  if (typeof e != "undefined"){
    if (docwidth - e.pageX < 300){
      xcoord = e.pageX - xcoord - 286; // Move to the left side of the cursor
    } else {
      xcoord += e.pageX;
    }
    if (docheight - e.pageY < (currentimageheight + 50)){
      ycoord += e.pageY - Math.max(0,(50 + currentimageheight + e.pageY - docheight - truebody().scrollTop));
    } else {
      ycoord += e.pageY;
    }

  } else if (typeof window.event != "undefined"){
    if (docwidth - event.clientX < 300){
      xcoord = event.clientX + truebody().scrollLeft - xcoord - 286; // Move to the left side of the cursor
    } else {
      xcoord += truebody().scrollLeft+event.clientX
    }
    if (docheight - event.clientY < (currentimageheight + 50)){
      ycoord += event.clientY + truebody().scrollTop - Math.max(0,(50 + currentimageheight + event.clientY - docheight));
    } else {
      ycoord += truebody().scrollTop + event.clientY;
    }
  }

  var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15
  var docheight=document.all? Math.max(truebody().scrollHeight, truebody().clientHeight) : Math.max(document.body.offsetHeight, window.innerHeight)

  gettrailobj().left=xcoord+"px"
  gettrailobj().top=Math.max(290, ycoord)+"px"

}