/*
Simple Image Trail script- By JavaScriptKit.com
Visit http://www.javascriptkit.com for this script and more
This notice must stay intact
 
Simple Image Trail script- By JavaScriptKit.com was originally modified by Tim Kroeger (tim@breakmyzencart.com)
for use with Image Handler 2 and better cross browser functionality
 
Later the Simple Image Trail script- By JavaScriptKit.com was further modified by
p.hailey@virgin.net in an attempt to  fix ie 6 issues see zencart forum IH2 thread
for details
 
Image Handler Jscript
Image Handler 5
Modified by Nigel Thomson (nigel@nigel.geek.nz) 12 June 2010
This  modified version of the Simple Image Trail script- By JavaScriptKit.com (4.1) brings in Opera
support, and fixes the webkit (Safari and Chrome) Bugs
Fix for horizontalscrollbar added 23 june 2010
http://nigeltsblog.blogspot.com/2010/06/zencart-image-handler-webkit-and-opera.html
Fix for IE9 added 16 March 2011
http://nigeltsblog.blogspot.com/2011/03/image-handler-and-internet-explorer-9.html
*/
 
var offsetfrommouse=[10,10]; //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 = 400;    // maximum image size.
var padding=10; // padding must by larger than specified div padding in stylessheet
 
// Global variables for sizes of hoverimg
// Defined in "showtrail()", used in "followmouse()"
var zoomimg_w=0;
var zoomimg_h=0;
var vpos;
//Detect IE
var stIsIE = /*@cc_on!@*/false;
//detect opera
var isOpera =
window.opera?1:0;
// Detect Webkit browsers
var isWebKit =
navigator.userAgent.indexOf("AppleWebKit") > -1;
 

window.addEventListener("load", function() { 
    document.body.insertAdjacentHTML('beforeend', '<div id="trailimageid"></div>');
});
 
function getObj(name) 
{
    if (document.getElementById) {
        this.obj = document.getElementById(name);
        this.style = document.getElementById(name).style;
    } else if (document.all) {
        this.obj = document.all[name];
        this.style = document.all[name].style;
    } else if (document.layers) {
        this.obj = document.layers[name];
        this.style = document.layers[name];
    }
}
 
function gettrail()
{
    return new getObj("trailimageid");
}
 
function truebody()
{
    if (isWebKit) {
        return document.body;
    } else if (isOpera) {
        return document.documentElement;
    } else {
      return (!window.opera && document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
    }
}
 
function showtrail(imagename,title,oriwidth,oriheight,zoomimgwidth,zoomimgheight, image, startx, starty, startw, starth)
{
    zoomimg_w=zoomimgwidth;
    zoomimg_h=zoomimgheight;
    if (zoomimgheight > 0) { 
        currentimageheight = zoomimgheight; 
    }
    trailobj = gettrail().obj;
    trailobj.style.width=(zoomimgwidth+(2*padding))+"px";
    trailobj.style.height=(zoomimgheight+(2*padding))+"px";
    trailobj.setAttribute("startx", startx);
    trailobj.setAttribute("starty", starty);
    trailobj.setAttribute("startw", startw);
    trailobj.setAttribute("starth", starth);
    trailobj.setAttribute("imagename", imagename);
    trailobj.setAttribute("imgtitle", title);
    document.onmousemove=followmouse;
}
 
function hidetrail()
{
    trailstyle = gettrail().style;
    trailstyle.visibility = "hidden";
    document.onmousemove = "";
    trailstyle.left = "-2000px";
    trailstyle.top = "-2000px";
}
 
function followmouse(e)
{
    var xcoord=offsetfrommouse[0];
    var ycoord=offsetfrommouse[1];
    if (stIsIE) {
        var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15;
        var docheight=document.all? Math.min(truebody().scrollHeight, truebody().clientHeight) : Math.min(window.innerHeight);
    } else {
        var docwidth=pageXOffset+window.innerWidth-15;
        var docheight=Math.min(window.innerHeight);
    }
    var relativeX = null;
    var relativeY = null;
    if ((typeof e != "undefined") && !(stIsIE)) { // This forces IE9 to go to the else option
        if ((typeof e.layerX != "undefined") && (typeof e.layerY != "undefined")) {
            relativeX = e.layerX;
            relativeY = e.layerY;
        } else if ((typeof e.x != "undefined") && (typeof e.y != "undefined")) {
  //      relativeX = e.x; // original code replaced to work with Opera
  //      relativeY = e.y; // original code replaced to work with Opera
            relativeX = event.offsetX;
            relativeY = event.offsetX;
        }
        if (docwidth - e.pageX < zoomimg_w + (3 * padding)) {
            xcoord = e.pageX - xcoord - zoomimg_w - (2 * offsetfrommouse[0]);
        } else {
            xcoord += e.pageX;
        }
        if (docheight - e.pageY < zoomimg_h + (2 * padding)){
            ycoord += e.pageY - Math.max(0,(0 + zoomimg_h + (5 * padding) + e.pageY - docheight - truebody().scrollTop));
            // returning different values for ff and (opera and webkit) - fixed 12th june 2010
        } else {
            ycoord += e.pageY;
        }
   
    } else if (typeof window.event != "undefined") { // This works for IE
        if ((typeof event.x != "undefined") && (typeof event.y != "undefined")) {
            relativeX = event.x;
            relativeY = event.y;
        } else if ((typeof event.offsetX != "undefined") && (event.offsetY != "undefined")) {
            relativeX = event.offsetX;
          relativeY = event.offsetY;
        }
   
        if (docwidth - event.clientX < zoomimg_w + (3 * padding)) {
            xcoord = event.clientX - xcoord - zoomimg_w - (2 * offsetfrommouse[0]);
        } else {
            xcoord += truebody().scrollLeft+event.clientX;
        }
        /* event.clientY is not valid in firefox netscape or opera, but ie has to use it */
        var ie_offset = -20;
        if ( docheight - event.clientY < zoomimg_h + (2 * padding) ){
  /*
  ycoord += event.clientY - Math.max(0,(0 + zoomimg_h + (5 * padding) - (docheight + truebody().scrollTop -event.clientY) ) );
  */
            ycoord += ie_offset + truebody().scrollTop + event.clientY - Math.max(0,(0 + zoomimg_h + (2 * padding) - (docheight - event.clientY) ) );
        } else {
            ycoord += ie_offset + truebody().scrollTop + event.clientY;
        }
    }
 
    trail = gettrail();
    startx    = trail.obj.getAttribute("startx");
    starty    = trail.obj.getAttribute("starty");
    startw    = trail.obj.getAttribute("startw");
    starth    = trail.obj.getAttribute("starth");
    imagename = trail.obj.getAttribute("imagename");
    title     = trail.obj.getAttribute("imgtitle");
 
  // calculate and set position BEFORE switching to visible
    if (stIsIE){
        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);
    } else {
        var docwidth=pageXOffset+window.innerWidth-15;
        var docheight=Math.max(document.body.offsetHeight, window.innerHeight);
    }
   
    if (ycoord < 0) { 
        ycoord = ycoord*-1; 
    }
    if ((trail.style.left == "-2000px") || (trail.style.left == "")) { 
        trail.style.left=xcoord+"px"; 
    }
    if ((trail.style.top == "-2000px") || (trail.style.top == "")) { 
        trail.style.top=ycoord+"px"; 
    }
    trail.style.left=xcoord+"px";
    trail.style.top=ycoord+"px";
   
    if (trail.style.visibility != "visible") {
        if ( (relativeX == null || relativeY == null) || 
             ( relativeX >= startx && relativeX <= (startx + startw) && relativeY >= starty && relativeY <= (starty + starth)) ) {
            newHTML = '<div><h1>' + title + '</h1>';
            newHTML = newHTML + '<img src="' + imagename + '"></div>';
            trail.obj.innerHTML = newHTML;
            trail.style.visibility = "visible";
        }
    }
}
