/* brainbook scripts */

var dir="images/";
var numPages=pages.length;
var curr=0;

// onload function
function prepare() {
    var p=0;
    preload();
    var args=getArgs();
    if (args.page) {
        p=parseInt(args.page);
        if (p>=numPages) {
            p=numPages-1;
        }
    }
	curr=p;
    showImages(p);
    
    // load menu
    var c='';
    var n;

	pages.each(function(page) {
        n=document.createElement("option");
        c=$("pageMenu").appendChild(n);
        n=document.createTextNode(page[0]);
        c.appendChild(n);
    });   
 
	// IE6 needs this deferral:
	setTimeout("$('pageMenu').selectedIndex = curr;",10);
	       
	var latestLink='';
    if (p>0) {
        latestLink=String(p)+" of "+String(numPages-1);
    } else {
        latestLink="";
    }
	latestLink += '<span id="latest">Latest: <a href="javascript:last()">'+pages[numPages-1][0]+'</a></span>'
	$("pageCount").innerHTML=latestLink;
    
    // hide transparent PNG from IE
	var ua = navigator.userAgent.toLowerCase(); 
	var v = navigator.appVersion;
	if ( (ua.indexOf("msie") != -1) && (v.indexOf("6") != -1) && (ua.indexOf("opera") == -1) && (ua.indexOf("webtv") == -1) ) {
		$("shading").addClassName("noBackground");
		$("shadingCover").addClassName("noBackground");
		// add subtle boder in place of shading overlay in IE6
		$("leftImage","rightImage").each(function(el) {$(el).addClassName('lightBorder')});
	} 
	
    if (curr==0) {
	// cover page:
        $("shading").style.display="none";
        $("shadingCover").style.display="block";
		Event.observe('shadingCover','click',next);
    } else {
	// otherwise:	
	    $("shading").style.display="block";
        $("shadingCover").style.display="none";
		Event.observe('shading','click',clickPage);
    }

}


function showImages(n) {
    if (pages[n][1]!="") {
        $("leftImage").src=dir+pages[n][1];   // left image
    } else {
        $("leftImage").src=""; 
    }
    
    if (pages[n][2]!="") {
        $("rightImage").src=dir+pages[n][2];  // right image
    } else {
        $("rightImage").style.display="none"; 
    } 

 	document.title=pages[n][0];    

}

function goPage(n) {
    // this reloads the document
    document.location.search="page="+n;
}

function first() {
	curr=0;
	goPage(curr);
}

function last() {
	curr=numPages-1;
	goPage(curr);
}

function prev() {
	curr=curr-1;
	if (curr<0) curr=numPages-1;
	goPage(curr);
}

function next() {
	curr=curr+1;
	if (curr==numPages) curr=0;
	goPage(curr);
}

function clickPage(e) {
    var x = e.offsetX?(e.offsetX):e.pageX-document.getElementById("shading").offsetLeft;
	if (x < 380) {
		prev()
	} else {
		next()
	}
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function preload() {
MM_preloadImages('/snow/images/bb_contents.gif','/snow/images/bb_contents.gif','/snow/images/bb_first.gif','/snow/images/bb_prev.gif','/snow/images/bb_next.gif','/snow/images/bb_last.gif')
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}