// -------------------------------------------------------------------
// Photo Album Script v2.0- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Mar 11th, 07': Script updated to v2.0
// -------------------------------------------------------------------

function photogallery(garray, cols, rows, twidth, theight, paginatetext) {
    gcount = (typeof gcount == "undefined") ? 1 : gcount + 1 //global var to keep count of current instance of photo gallery
    this.gcount = gcount
    this.galleryarray = garray
    this.cols = cols
    this.rows = rows
    var twidth = twidth || "700x" //default table width is 700px
    var theight = theight || "500px"
    var ptext = (typeof paginatetext == "object") ? paginatetext : ["Page", ""] //Store 2 compontents of paginate DIV text inside array
    this.pagecount = Math.ceil(this.galleryarray.length / (cols * rows)) //calculate number of "pages" needed to show the images
    document.write('<table class="photogallery" id="photogallery-' + gcount + '" style="width:' + twidth + '; height:' + theight + ';">') //Generate table for Photo Gallery
    for (var r = 0; r < rows; r++) {
        document.write('<tr>')
        for (var c = 0; c < cols; c++)
            document.write('<td valign="top"></td>')
        document.write('</tr>')
    }
    document.write('</table>')
    document.write('<div class="photonavlinks" id="photogallerypaginate-' + gcount + '"></div>') //Generate Paginate Div

    var gdiv = document.getElementById("photogallery-" + this.gcount)
    var pdiv = document.getElementById("photogallerypaginate-" + this.gcount)
    gdiv.onselectphoto = function(imgobj, linkobj) { return true } //custom event handler "onselectphoto", invoked when user clicks on an image within gallery
    this.showpage(gdiv, 0)
    this.createNav(gdiv, pdiv, ptext)
    gdiv.onclick = function(e) { return photogallery.defaultselectaction(e, this) } //attach default custom event handler action to "onclick" event
    return gdiv
}


photogallery.prototype.createImage = function(imgparts) {
    var imageHTML = '<img src="' + imgparts[0] + '" title="' + imgparts[1] + '"/>'
    if (typeof imgparts[2] != "undefined" && imgparts[2] != "") { //Create URL?
        var linktarget = imgparts[3] || ""
        imageHTML = '<a href="' + imgparts[2] + '" target="' + linktarget + '">' + imageHTML + '</a>'
    }
    if (typeof imgparts[1] != "undefined" && imgparts[1] != "") //Display description?
        imageHTML += '<br />' + imgparts[1]
    return imageHTML
}


photogallery.prototype.showpage = function(gdiv, pagenumber) {
    var totalitems = this.galleryarray.length //total number of images
    var showstartindex = pagenumber * (this.rows * this.cols) //array index of div to start showing per pagenumber setting
    var showendindex = showstartindex + (this.rows * this.cols) //array index of div to stop showing after per pagenumber setting
    var tablecells = gdiv.getElementsByTagName("td")
    for (var i = showstartindex, currentcell = 0; i < showendindex && i < totalitems; i++, currentcell++) //Loop thru this page's images and populate cells with them
        tablecells[currentcell].innerHTML = this.createImage(this.galleryarray[i])
    while (currentcell < tablecells.length) { //For unused cells, if any, clear out its contents
        tablecells[currentcell].innerHTML = ""
        currentcell++
    }
}

photogallery.prototype.createNav = function(gdiv, pdiv, ptext) {
    var instanceOfGallery = this
    var navHTML = ""
    for (var i = 0; i < this.pagecount; i++)
        navHTML += '<a href="#navigate" rel="' + i + '">' + ptext[1] + (i + 1) + '</a> ' //build sequential nav links
    pdiv.innerHTML = ptext[0] + ' ' + navHTML
    var navlinks = pdiv.getElementsByTagName("a")
    navlinks[0].className = "current" //Select first link by default
    this.previouspage = navlinks[0] //Set previous clicked on link to current link for future ref
    for (var i = 0; i < navlinks.length; i++) {
        navlinks[i].onclick = function() {
            instanceOfGallery.previouspage.className = "" //"Unhighlight" last link clicked on...
            this.className = "current" //while "highlighting" currently clicked on flatview link (setting its class name to "selected"
            instanceOfGallery.showpage(gdiv, this.getAttribute("rel"))
            instanceOfGallery.previouspage = this //Set previous clicked on link to current link for future ref
            return false
        }
    }
}

photogallery.defaultselectaction = function(e, gdiv) { //function that runs user defined "onselectphoto()" event handler
    var evtobj = e || window.event
    var clickedobj = evtobj.target || evtobj.srcElement
    if (clickedobj.tagName == "IMG") {
        var linkobj = (clickedobj.parentNode.tagName == "A") ? clickedobj.parentNode : null
        return gdiv.onselectphoto(clickedobj, linkobj)
    }
}