var offsetfrommouse = [15, 25]; //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 defaultimageheight = 40; // maximum image size.
var defaultimagewidth = 40; // maximum image size.

var timer;

var t_id = setInterval(animate, 20);
var pos = 0;
var dir = 2;
var len = 0;

function animate() {
    var elem = document.getElementById('progress');
    if (elem != null) {
        if (pos == 0) len += dir;
        if (len > 32 || pos > 79) pos += dir;
        if (pos > 79) len -= dir;
        if (pos > 79 && len == 0) pos = 0;
        elem.style.left = pos;
        elem.style.width = len;
    }
}


function remove_loading() {
    this.clearInterval(t_id);
    var targelem = document.getElementById('loader_container');
    targelem.style.display = 'none';
    targelem.style.visibility = 'hidden';
    var t_id = setInterval(animate, 60);
}

function gettrailobj() {

    if (document.getElementById)
        return document.getElementById("preview_div").style
}

function gettrailobjnostyle() {
    if (document.getElementById)
        return document.getElementById("preview_div")
}


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


function hidetrail() {
    gettrailobj().display = "none";
    document.onmousemove = ""
    gettrailobj().left = "-500px"
    clearTimeout(timer);
}

function showtrail(imagename, title, width, height) {

    i = imagename
    t = title
    w = width
    h = height
    timer = setTimeout("show('" + i + "',t,w,h);", 100);
}

function show(imagename, title, width, height) {

    var docwidth = document.all ? truebody().scrollLeft + truebody().clientWidth : pageXOffset + window.innerWidth - offsetfrommouse[0]
    var docheight = document.all ? Math.min(truebody().scrollHeight, truebody().clientHeight) : Math.min(window.innerHeight)

    if ((navigator.userAgent.indexOf("Konqueror") == -1 || navigator.userAgent.indexOf("Firefox") != -1 || (navigator.userAgent.indexOf("Opera") == -1 && navigator.appVersion.indexOf("MSIE") != -1))) {
        (width == 0) ? width = defaultimagewidth : '';
        (height == 0) ? height = defaultimageheight : '';

        width += 0
        height += 5
        defaultimageheight = height
        defaultimagewidth = width

        document.onmousemove = followmouse;

        newHTML = '<div class="border_preview" style="width:' + width + 'px;height:' + height + 'px"><div id="loader_container"><div id="loader"><div align="center">   Carregando a imagem...</div><div id="loader_bg"><div id="progress"> </div></div></div></div>';

        newHTML = newHTML + '<div class="preview_temp_load"><img onload="javascript:remove_loading();" src="' + imagename.replace("_pq", "_gd") + '" border="0"></div>';
        newHTML = newHTML + '</div>';

        if (navigator.userAgent.indexOf("MSIE") != -1 && navigator.userAgent.indexOf("Opera") == -1) {
            newHTML = newHTML + '<iframe src="about:blank" scrolling="no" frameborder="0" width="' + width + '" height="' + height + '"></iframe>';
        }

        gettrailobjnostyle().innerHTML = newHTML;
        gettrailobj().display = "block";
    }
}

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 (typeof e != "undefined") {
        if (docwidth - e.pageX < defaultimagewidth + 2 * offsetfrommouse[0]) {
            xcoord = e.pageX - xcoord - defaultimagewidth; // Move to the left side of the cursor
        } else {
            xcoord += e.pageX;
        }
        if (docheight - e.pageY < defaultimageheight + 2 * offsetfrommouse[1]) {
            ycoord += e.pageY - Math.max(0, (2 * offsetfrommouse[1] + defaultimageheight + e.pageY - docheight - truebody().scrollTop));
        } else {
            ycoord += e.pageY;
        }

    } else if (typeof window.event != "undefined") {
        if (docwidth - event.clientX < defaultimagewidth + 2 * offsetfrommouse[0]) {
            xcoord = event.clientX + truebody().scrollLeft - xcoord - defaultimagewidth; // Move to the left side of the cursor
        } else {
            xcoord += truebody().scrollLeft + event.clientX
        }
        if (docheight - event.clientY < (defaultimageheight + 2 * offsetfrommouse[1])) {
            ycoord += event.clientY + truebody().scrollTop - Math.max(0, (2 * offsetfrommouse[1] + defaultimageheight + event.clientY - docheight));
        } else {
            ycoord += truebody().scrollTop + event.clientY;
        }
    }
    gettrailobj().left = xcoord + "px"
    gettrailobj().top = ycoord + "px"

}

function initAlts() {
    arr = document.getElementsByName('title')
    
    titles = new Array()
    xs = new Array()
    ys = new Array()
    for (i = 0; i < arr.length; i++) {
        itemm = arr.item(i)
        itemm.onmouseover = prepareShowAlt
        itemm.onmouseout = hideAlt
        itemm.id = "title_" + i
        titles[i] = itemm.title
        xs[i] = (typeof itemm.xs == 'undefined' ? 0 : itemm.xs)
        ys[i] = (typeof itemm.ys == 'undefined' ? 0 : itemm.ys)
        itemm.title = ""
    }
}