//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: ['_overlayer/layer1.html'],
    
    //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="_overlayer/_layout/_gfx/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: false,
    
    //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="auto"
            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()