//Interstitial Content Box v1.1- http://www.dynamicdrive.com/dynamicindex17/interstitial.htm
//Last modified: Nov 26th, 06' (New: disable webpage scrollbar, auto hide after x seconds options, 

var interstitialBox = {
    //1) list of files on server to randomly pick from and display
    displayfiles: ['popup.aspx'],

    //2) display freqency: ["frequency_type", "frequency_value"]
    displayfrequency: ["chance", "1"],

    //3) HTML for the header bar portion of the interstitial box
    defineheader: '<div class="headerbar"><a href="#" onClick="javascript:interstitialBox.closeit(); return false"><img src="closeit.gif" style="border: 0" title="Close Box"/></a></div>',

    //4) cookie setting: ["cookie_name", "cookie_path"]
    cookiesetting: ["stitialcookie", "path=/"],

    //5) bust caching of pages fetched via Ajax?
    ajaxbustcache: true,

    //6) Disable browser scrollbars while interstitial is shown (Only applicable in IE7/Firefox/Opera8+. IE6 will just auto scroll page to top)?
    disablescrollbars: true,

    //7) Auto hide Interstitial Box after x seconds (0 for no)?
    autohidetimer: 0,

    ////No need to edit beyond here//////////////////////////////////

    ie7: window.XMLHttpRequest && document.all && !window.opera,
    ie7offline: this.ie7 && window.location.href.indexOf("http") == -1, //check for IE7 and offline
    launch: false,
    scrollbarwidth: 16,

    ajaxconnect: function(url, thediv) {
        var page_request = false
        var bustcacheparameter = ""
        if (window.XMLHttpRequest && !this.ie7offline) // if Mozilla, IE7 online, Safari etc
            page_request = new XMLHttpRequest()
        else if (window.ActiveXObject) { // if IE6 or below, or IE7 offline (for testing purposes)
            try {
                page_request = new ActiveXObject("Msxml2.XMLHTTP")
            }
            catch (e) {
                try {
                    page_request = new ActiveXObject("Microsoft.XMLHTTP")
                }
                catch (e) { }
            }
        }
        else
            return false
        page_request.onreadystatechange = function() {
            interstitialBox.loadpage(page_request, thediv)
        }
        if (this.ajaxbustcache) //if bust caching of external page
            bustcacheparameter = (url.indexOf("?") != -1) ? "&" + new Date().getTime() : "?" + new Date().getTime()
        page_request.open('GET', url + bustcacheparameter, true)
        page_request.send(null)
    },

    loadpage: function(page_request, thediv) {
        if (page_request.readyState == 4 && (page_request.status == 200 || window.location.href.indexOf("http") == -1)) {
            document.getElementById("interContent").innerHTML = page_request.responseText
        }
    },

    createcontainer: function() {
        //write out entire HTML for Interstitial Box:
        document.write('<div id="interContainer">' + this.defineheader + '<div id="interContent"></div></div><div id="interVeil"></div>')
        this.interContainer = document.getElementById("interContainer") //reference interstitial container
        this.interVeil = document.getElementById("interVeil") //reference veil
        this.standardbody = (document.compatMode == "CSS1Compat") ? document.documentElement : document.body //create reference to common "body" across doctypes
    },


    showcontainer: function() {
        if (this.interContainer.style.display == "none") return //if interstitial box has already closed, just exit (window.onresize event triggers function)
        var ie = document.all && !window.opera
        var dom = document.getElementById
        var scroll_top = (ie) ? this.standardbody.scrollTop : window.pageYOffset
        var scroll_left = (ie) ? this.standardbody.scrollLeft : window.pageXOffset
        var docwidth = (ie) ? this.standardbody.clientWidth : window.innerWidth - this.scrollbarwidth
        var docheight = (ie) ? this.standardbody.clientHeight : window.innerHeight
        var docheightcomplete = (this.standardbody.offsetHeight > this.standardbody.scrollHeight) ? this.standardbody.offsetHeight : this.standardbody.scrollHeight
        var objwidth = this.interContainer.offsetWidth
        var objheight = this.interContainer.offsetHeight
        this.interVeil.style.width = docwidth + "px" //set up veil over page
        this.interVeil.style.height = docheightcomplete + "px" //set up veil over page
        this.interVeil.style.left = 0 //Position veil over page
        this.interVeil.style.top = 0 //Position veil over page
        this.interVeil.style.visibility = "visible" //Show veil over page
        this.interContainer.style.left = docwidth / 2 - objwidth / 2 + "px" //Position interstitial box
        var topposition = (docheight > objheight) ? scroll_top + docheight / 2 - objheight / 2 + "px" : scroll_top + 5 + "px" //Position interstitial box
        this.interContainer.style.top = Math.floor(parseInt(topposition)) + "px"
        this.interContainer.style.visibility = "visible" //Show interstitial box
        if (this.autohidetimer && parseInt(this.autohidetimer) > 0 && typeof this.timervar == "undefined")
            this.timervar = setTimeout("interstitialBox.closeit()", this.autohidetimer * 1000)
    },


    closeit: function() {
        this.interVeil.style.display = "none"
        this.interContainer.style.display = "none"
        if (this.disablescrollbars && window.XMLHttpRequest) //if disablescrollbars enabled and modern browsers- IE7, Firefox, Safari, Opera 8+ etc
            this.standardbody.style.overflow = "auto"
        if (typeof this.timervar != "undefined") clearTimeout(this.timervar)
    },

    getscrollbarwidth: function() {
        var scrollbarwidth = window.innerWidth - (this.interVeil.offsetLeft + this.interVeil.offsetWidth) //http://www.howtocreate.co.uk/emails/BrynDyment.html
        this.scrollbarwidth = (typeof scrollbarwidth == "number") ? scrollbarwidth : this.scrollbarwidth
    },

    hidescrollbar: function() {
        if (this.disablescrollbars) { //if disablescrollbars enabled
            if (window.XMLHttpRequest) //if modern browsers- IE7, Firefox, Safari, Opera 8+ etc
                this.standardbody.style.overflow = "hidden"
            else //if IE6 and below, just scroll to top of page to ensure interstitial is in focus
                window.scrollTo(0, 0)
        }
    },

    dotask: function(target, functionref, tasktype) { //assign a function to execute to an event handler (ie: onunload)
        var tasktype = (window.addEventListener) ? tasktype : "on" + tasktype
        if (target.addEventListener)
            target.addEventListener(tasktype, functionref, false)
        else if (target.attachEvent)
            target.attachEvent(tasktype, functionref)
    },

    initialize: function() {
        this.createcontainer() //write out interstitial container
        this.ajaxconnect(this.displayfiles[Math.floor(Math.random() * this.displayfiles.length)], this.interContainer) //load page into content via ajax
        this.dotask(window, function() { interstitialBox.hidescrollbar(); interstitialBox.getscrollbarwidth(); setTimeout("interstitialBox.showcontainer()", 100) }, "load")
        this.dotask(window, function() { interstitialBox.showcontainer() }, "resize")
    }
}

/////////////End of interstitialBox object declaration here ////////////////////////////////

function getCookie(Name) {
    var re = new RegExp(Name + "=[^;]+", "i"); //construct RE to search for target name/value pair
    if (document.cookie.match(re)) //if cookie found
        return document.cookie.match(re)[0].split("=")[1] //return its value
    return null
}

function setCookie(name, value, days) {
    var expireDate = new Date()
    //set "expstring" to either an explicit date (past or future)
    if (typeof days != "undefined") { //if set persistent cookie
        var expstring = expireDate.setDate(expireDate.getDate() + parseInt(days))
        document.cookie = name + "=" + value + "; expires=" + expireDate.toGMTString() + "; " + interstitialBox.cookiesetting[1]
    }
    else //else if this is a session only cookie setting
        document.cookie = name + "=" + value + "; " + interstitialBox.cookiesetting[1]
}


var stitialvars = new Object() //temporary object to reference/ shorthand certain interstitialBox properties
stitialvars.freqtype = interstitialBox.displayfrequency[0] //"chance" or "cookie"
stitialvars.cookieduration = interstitialBox.displayfrequency[1] //"session" or int (integer specifying number of days)
stitialvars.cookiename = interstitialBox.cookiesetting[0] //name of cookie to use


if (stitialvars.freqtype == "chance") { //IF CHANCE MODE
    if (Math.floor(Math.random() * interstitialBox.displayfrequency[1]) == 0)
        interstitialBox.launch = true
}
else if (stitialvars.freqtype == "cookie" && stitialvars.cookieduration == "session") { //IF "SESSION COOKIE" MODE
    if (getCookie(stitialvars.cookiename + "_s") == null) { //if session cookie is empty
        setCookie(stitialvars.cookiename + "_s", "loaded")
        interstitialBox.launch = true
    }
}
else if (stitialvars.freqtype == "cookie" && typeof parseInt(stitialvars.cookieduration) == "number") { //IF "PERSISTENT COOKIE" MODE
    if (getCookie(stitialvars.cookiename) == null || parseInt(getCookie(stitialvars.cookiename)) != parseInt(stitialvars.cookieduration)) { //if persistent cookie is empty or admin has changed number of days to persist from that of the stored value (meaning, reset it)
        setCookie(stitialvars.cookiename, stitialvars.cookieduration, stitialvars.cookieduration)
        interstitialBox.launch = true
    }
}

if (interstitialBox.launch)
    interstitialBox.initialize()