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="trailimageid">');
    document.write('</div>');
}

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

function gettrailobjnostyle(){
if (document.getElementById)
return document.getElementById("trailimageid")
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,height){
    if (height > 0){
        currentimageheight = height;
    }
    document.onmousemove=followmouse;
    newHTML = '<div style="padding: 5px; background-color: #f4f4f4; border: 1px solid #7e93c0;">';
    newHTML = newHTML + '<div align="center" style="padding: 2px 2px 2px 2px;">';
    newHTML = newHTML + '<img src="' + imagename + '" border="0"></div>';

    newHTML = newHTML + '</div>';
    gettrailobjnostyle().innerHTML = newHTML;
    gettrailobj().display="inline";
}

function showtrailBatch(imagename,title,filetype){
    document.onmousemove=followmouseBatch;

    cameraHTML = '';
    newHTML = '<div style="padding: 5px; background-color: #FFF; border: 1px solid #888;" id="trailInnerDiv">';
    newHTML = newHTML + '<div align="center" style="padding: 8px 2px 2px 2px;">';
    newHTML = newHTML + '<img src="' + imagename + '" border="0"></div>';

    newHTML = newHTML + '</div>';
    gettrailobjnostyle().innerHTML = newHTML;
    gettrailobj().display="inline";
    gettrailobj().position="absolute";
    currentimageheight = $('trailInnerDiv').offsetHeight;
}

function hidetrail(){
    gettrailobj().innerHTML = " ";
    gettrailobj().display="none"
    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(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 < 380){
            xcoord = e.pageX - xcoord - 400; // Move to the left side of the cursor
        } else {
            xcoord += e.pageX;
        }
        if (docheight - e.pageY < (currentimageheight + 110)){
            ycoord += e.pageY - Math.max(0,(110 + currentimageheight + e.pageY - docheight - truebody().scrollTop));
        } else {
            ycoord += e.pageY;
        }

    } else if (typeof window.event != "undefined"){
        if (docwidth - event.clientX < 380){
            xcoord = event.clientX + truebody().scrollLeft - xcoord - 400; // Move to the left side of the cursor
        } else {
            xcoord += truebody().scrollLeft+event.clientX
        }
        if (docheight - event.clientY < (currentimageheight + 110)){
            ycoord += event.clientY + truebody().scrollTop - Math.max(0,(110 + currentimageheight + event.clientY - docheight));
        } else {
            ycoord += truebody().scrollTop + event.clientY;
        }
    }

    if(ycoord < 0) { ycoord = ycoord*-1; }
    gettrailobj().left=xcoord+"px"
    gettrailobj().top=ycoord+"px"

}

function followmouseBatch(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(window.innerHeight)

    var trailInnerDiv = $('trailInnerDiv');
    var currentimageheight = trailInnerDiv.offsetHeight;
    var currentimagewidth = trailInnerDiv.offsetWidth;

    scrollPos = Position.realOffset(truebody());
    
    if (typeof e != "undefined"){
        if (docwidth - e.pageX < 380){
            xcoord = e.pageX - xcoord - 400; // Move to the left side of the cursor
        } else {
            xcoord += e.pageX;
        }
        if ((e.pageY - scrollPos[1]) + currentimageheight > docheight){
            ycoord = -ycoord + (e.pageY - currentimageheight);
        } else {
            ycoord += e.pageY;
        }
    } else if (typeof window.event != "undefined"){
        if (event.clientX + currentimagewidth > docwidth){
            xcoord = -xcoord + ((event.clientX + scrollPos[0]) - currentimagewidth); // Move to the left side of the cursor
        } else {
            xcoord += (event.clientX + scrollPos[0]);
        }
        if (event.clientY + currentimageheight > docheight){
            ycoord = -ycoord + ((event.clientY + scrollPos[1]) - currentimageheight);
        } else {
            ycoord += (event.clientY + scrollPos[1]);
        }
    }

    if(ycoord < 0) { ycoord = ycoord*-1; }

    gettrailobj().left=xcoord+"px"
    gettrailobj().top=ycoord+"px"

}