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_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 MM_findObj(n, d) { //v4.0
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);
if(!x && document.getElementById) x=document.getElementById(n); 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];}
}

// frame busting
// if(top!= self) top.location.href = self.location.href

// flash interaction
function getLocation() {
  return window.location.toString();
}

// localization
DecSep = (1.5).toLocaleString().charAt(1);
ThouSep = String.fromCharCode(90 - DecSep.charCodeAt(0));
if (DecSep==",") { DecType = "c"; } else { DecType = ""; }
function decfmt() {
	if (DecSep==",") {
  		// 0,00=>0#00 then 0.0=>0,0, then 0#0=>0.0  
		document.body.innerHTML=document.body.innerHTML.replace(/(\d),(\d\d)/g,'$1#$2').replace(/(\d)\.(\d)/g,'$1,$2').replace(/(\d)#(\d)/g,'$1.$2');
		// images replace "." with "c."
		var imgs = document.body.getElementsByTagName("img"); 
		for (var i = 0; i < imgs.length; i++) { 
			if (imgs[i].getAttribute("hasdec")!=null && imgs[i].getAttribute("hasdec")!="") {
				imgs[i].src=imgs[i].src.replace(/\.(gif|jpg|png)/g,"c.$1");
			}
		}
	}
}
function doSpell() {
    var userLang = (navigator.language) ? navigator.language : navigator.userLanguage;
    switch (userLang.toLowerCase()) {
    case "en-us":
        break;
    case "en-au":
    case "en-ca":
    case "en-gb":
    case "en-ie":
    case "en-nz":
    case "en-za":
        var s = document.body.innerHTML;
        for (var i=0; i<reSpell.length; i++) {
            var s0 = reSpell[i][0];
            var s1 = reSpell[i][1];
     		s = s.replace(new RegExp('\\b' + s0 + '\\b' , 'g'), s1).replace(new RegExp('\\b' + proper(s0) + '\\b' , 'g'), proper(s1));
        }  
        document.body.innerHTML = s;
        break;
    default:
    }    
}
function doLocal() { decfmt(); doSpell(); }
function proper(s) { return s.charAt(0).toUpperCase() + s.substring(1,s.length).toLowerCase(); }
if (typeof(hasdec)=='undefined' && typeof(reSpell)=='undefined') {
} else {
	window.onload = doLocal;
}

function tellAFriend() {
	var msg = "\nI found '" + document.title + "' here: " + location.href + "\n";
	window.location = "mailto:?subject="+encodeURIComponent(document.title)+"&body="+encodeURIComponent(msg);
}
function addFavorites() {
    if (window.sidebar) { // Mozilla Firefox Bookmark
		window.sidebar.addPanel( document.title, location.href, "");
	} else if( window.external ) { // IE Favorite
		window.external.AddFavorite( location.href, document.title ); 
    } 
}
function openEnglish() {
    if (typeof tranfrom == 'undefined') tranfrom='index.htm';
	var path = tranfrom;  // only relative path to avoid spoofing
	var url = "http://www.mathsisfun.com/" + path;
 	window.location = url;
}
function linkToUs() {
	var path = location.pathname + location.search;  // only relative path to avoid spoofing         
	var title = document.title;
 	postWith("http://" + document.domain + "/link-to-us.php",{path:path,title:title});
}
function Citation() {
	var months=new Array('Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');
	var path = location.pathname + location.search;  // only relative path to avoid spoofing
	var atitle = document.title;
	var md = new Date(document.lastModified)
	mDate = md.getDate() + " " + months[md.getMonth()] + " " + md.getFullYear();
    if (typeof Author == 'undefined') Author='Pierce, Rod';
    postWith("http://" + document.domain + "/citation.php",{path:path,title:atitle,moddate:mDate,author:Author});
}
function Contribute() {
	var path = location.pathname + location.search;  // only relative path to avoid spoofing
	var atitle = document.title;
    postWith("http://" + document.domain + "/contribute.php",{path:path,title:atitle});
}
function postWith (to,p) {
// from http://mentaljetsam.wordpress.com
  var myForm = document.createElement("form");
  myForm.method="post" ;
  myForm.action = to ;
  for (var k in p) {
    var myInput = document.createElement("input") ;
    myInput.setAttribute("name", k) ;
    myInput.setAttribute("value", p[k]);
    myForm.appendChild(myInput) ;
  }
  document.body.appendChild(myForm) ;
  myForm.submit() ;
  document.body.removeChild(myForm) ;
}

function URLEncode(text) {
	// The Javascript escape and unescape functions do not correspond with what browsers actually do...
	var SAFECHARS = "0123456789" + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "abcdefghijklmnopqrstuvwxyz" + "-_.!~*'()"; // numeric,alpha, and RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";

	var s = "";
	for (var i=0; i<text.length; i++ ) {
		var ch = text.charAt(i);
	    if (ch == " ") {
		    s += "+";	// x-www-urlencoded, rather than %20
		} else if (SAFECHARS.indexOf(ch) != -1) {
		    s += ch;
		} else {
		    var charCode = ch.charCodeAt(0);
			if (charCode > 255) {  // Unicode cannot be encoded using standard URL encoding
				s += "+";
			} else {
				s += "%";
				s += HEX.charAt((charCode >> 4) & 0xF);
				s += HEX.charAt(charCode & 0xF);
			}
		}
	} 

	return s;
};



function CopyToClipboard(txtArea) {
   txtArea.focus();
   txtArea.select();
   CopiedTxt = document.selection.createRange();
   CopiedTxt.execCommand("Copy");
}

/* Flash */
function getFlash6HTML(w, h, fn, querystring, colour) {
	// w=width, h=height, fn=filename(minus '.swf'), querystring=..., colour=bg colour
		if (!querystring) {querystring = "";} else {querystring = "?" +querystring;}
	// default background colour
		if (!colour) {colour="#d6d9e6";}

	// append .swf if absent 
	if (fn.substring(fn.lastIndexOf('.swf')) != '.swf') fn = fn + '.swf';

	var myHTML = '<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http:\/\/download.macromedia.com\/pub\/shockwave\/cabs\/flash\/swflash.cab#version=6,0,79,0"/n width="' + w + '" height="' + h + '" id="' + fn + '">\n';
 		myHTML += '<param name="movie" value="' + fn + querystring + '"\/> ';
		myHTML += '<param name="quality" value="high"\/> ';
		myHTML += '<param name="bgcolor" value="' + colour + '"\/> ';
		myHTML += '<param name="menu" value="false"\/> ';
		myHTML += '<param name="allowScriptAccess" value="sameDomain"\/> ';

		myHTML += '<embed src="' + fn + querystring + '" quality="high" bgcolor="' + colour + '" ';
		myHTML += 'menu="false" width="' + w + '" height="' + h + '" type="application\/x-shockwave-flash" ';
		myHTML += 'pluginspage="http:\/\/www.macromedia.com\/go\/getflashplayer" ';
		myHTML += 'swLiveConnect="true" allowscriptaccess="samedomain" id="' + fn + '" name="' + fn + '"><noembed><\/noembed><\/embed>\n';
        myHTML += '</object>\n';

		return(myHTML);
}
function putFlash6(w, h, fn, querystring, colour, id) {
	document.write(getFlash6HTML(w, h, fn, querystring, colour));
}
function FlashPHP(w, h, pathtoswf, colour) {
	var path = location.pathname;  
	path = URLEncode(path.substring(0,path.lastIndexOf('/')));
	var atitle = URLEncode(document.title);
	var url = "http://" + document.domain + "/flash.php?path=" + path + "/" + pathtoswf + "&w=" + w + "&h=" + h + "&col=" + URLEncode(colour) + "&title=" + atitle ;
 	window.location = url;
}

/* ads */
var adIDs = Array(Array('topads',1,0), Array('hideads1',1,0), Array('showads1',0,1) );
function sethideadscookie(val) {
    var date = new Date();
    if (val == 1)
		date.setTime(date.getTime()+(1*24*60*60*1000));
	else
		date.setTime(date.getTime()-(30*24*60*60*1000));
    document.cookie = "math_hideads="+val+"; expires="+date.toGMTString()+"; path=/";
}

function setAds(stateNo) {
	var styles = Array('none', 'inline');
	for (var i = 0; i < adIDs.length; i++) {
		var e = document.getElementById(adIDs[i][0]);
		if (e) {
            var styleNo = adIDs[i][stateNo];
		    //alert(style);
			if (navigator.userAgent.indexOf('MSIE') > 0) {
				//e.style.setAttribute('csstext', style, 0);
				e.style.display = styles[styleNo];
			} else {
                var style = "display: " + styles[styleNo] + ";";
				e.setAttribute('style', style); 
			}
		}
	}
}

function hideads() {
	sethideadscookie(1);
	setAds(2);
}

function showads() {
	sethideadscookie(0);
	setAds(1);
}

var ca = document.cookie.split(';');

for(var i=0; i<ca.length; i++) {
    var c = ca[i];
    var pair = c.split('=');
    var key = pair[0];
    var value = pair[1];
    key=key.replace(/ /, '');
    if (key == 'math_hideads') {
		if (value == '1') {
			document.write('<style type="text/css" media="screen">#topads { display: none; }\n #hideads1 { display: none; }\n #showads1 { display: inline; }</style>');
		}
    }
}

/* Question Database */
function doQ(id) {
	var fromPath = location.pathname + location.search;  // only relative path to avoid spoofing
	var url = "http://www.mathopolis.com/questions/q.php?id=" + parseInt(id) + "&site=1" + "&ref=" + fromPath;
 	//window.location = url;
    window.open(url, "mathopolis");
}