/* ===================================================
	Global Javascripts - Dyson
	Version: v2.0
	Author: James Taylor - 07/01/2008
/* =================================================*/

/* Break out of frames */
//if (top.location != location) top.location.href = document.location.href;

if (top.location != location) {
    if (document.referrer.indexOf(document.domain) == -1 && document.referrer.indexOf("http://styx") == -1) {
        top.location.href = document.location.href;
    }
}


/* Global Flags */
var w3 = !!(document.getElementById && document.createElement);
var browser = identifyBrowser();

function stopDefaultAction(event) {
	event.returnValue = false;
	if (typeof event.preventDefault != "undefined"){
		event.preventDefault();
	}
	return true;
}

/* 
	Gets all elements that match an attribute and attribute value pair
	E.G. var arrGoogleLinks = getElementsByAttribute("href","http://www.google.com");
*/
function getElementsByAttribute(attribute, attributeValue){
	var elementArray = new Array();
	var matchedArray = new Array();
	if (document.all){
		elementArray = document.all;
	}else{
	    elementArray = document.getElementsByTagName("*");
	}
	for (var i = 0; i < elementArray.length; i++){
		if (attribute == "class"){
			var pattern = new RegExp("(^| )" + attributeValue + "( |$)");
			if (elementArray[i].className.match(pattern)){
		        matchedArray[matchedArray.length] = elementArray[i];
			}
	    }else if (attribute == "for"){
			if (elementArray[i].getAttribute("htmlFor") || elementArray[i].getAttribute("for")){
				if (elementArray[i].htmlFor == attributeValue){
					matchedArray[matchedArray.length] = elementArray[i];
				}
			}
		}else if (elementArray[i].getAttribute(attribute) == attributeValue){
			matchedArray[matchedArray.length] = elementArray[i];
		}
	}
	return matchedArray;
}

// hide / show errors in forms
function showError(idField, idErr, strMsg) {
	if(!$(idErr)){
		var errorSpan = document.createElement("span");
		var errorMessage = document.createTextNode(strMsg);
	    errorSpan.appendChild(errorMessage);
		errorSpan.className = "err";
		errorSpan.id = idErr;
		var cont = $(idField).parentNode;
		cont.appendChild(errorSpan);
	}
}
function hideError(idErr) {
	if($(idErr)){
		var errorSpan = $(idErr);
		var cont = errorSpan.parentNode;
		cont.removeChild(errorSpan);
	}
}
function trim(stringToTrim) {
	return stringToTrim.replace(/^\s+|\s+$/g,"");
}
function isValidEmail(str) {
	var at="@";
	var dot=".";
	var lat=str.indexOf(at);
	var lstr=str.length;
	var ldot=str.indexOf(dot);
	if (str.indexOf(at)==-1) return false;
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr) return false;
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr) return false;
	if (str.indexOf(at,(lat+1))!=-1) return false;
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot) return false;
	if (str.indexOf(dot,(lat+2))==-1) return false;
	if (str.indexOf(" ")!=-1) return false;
	return true					
}

// *** Same as Right/Left function in VB *** //
function Right(str, n){
    if (n <= 0) return "";
    else if (n > String(str).length) return str;
    else { var iLen = String(str).length; return String(str).substring(iLen, iLen - n); }
}
function Left(str, n){
	if (n <= 0) return "";
	else if (n > String(str).length) return str;
	else return String(str).substring(0,n);
}

function IsNumeric(sText) {
   var ValidChars = "0123456789";
   var IsNumber=true;
   var Char;
   for (i = 0; i < sText.length && IsNumber == true; i++) { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) IsNumber = false;
   }
   return IsNumber;
}

/* 
	returns browser & version
	E.G. "ie7" or "ie5mac" or "mozilla" or "opera7" or "safari1.2"
*/
function identifyBrowser() {
	var agent = navigator.userAgent.toLowerCase();
	if (typeof navigator.vendor != "undefined" && navigator.vendor == "KDE" && typeof window.sidebar != "undefined")  {
		return "kde";
	}else if (typeof window.opera != "undefined"){
		var version = parseFloat(agent.replace(/.*opera[\/ ]([^ $]+).*/, "$1"));
	    if (version >= 7){
			return "opera7";
		}else if (version >= 5){
			return "opera5";
		}
	    return false;
	}else if (typeof document.all != "undefined"){
		if (typeof document.getElementById != "undefined"){
			var browser = agent.replace(/.*ms(ie[\/ ][^ $]+).*/, "$1").replace(/ /, "");
			if (typeof document.uniqueID != "undefined"){
				if (browser.indexOf("5.5") != -1){
					return browser.replace(/(.*5\.5).*/, "$1");
				}else{
					return browser.replace(/(.*)\..*/, "$1");
				}
      		}else{
				return "ie5mac";
			}
		}
		return false;
	}else if (typeof document.getElementById != "undefined")  {
		if (navigator.vendor.indexOf("Google Inc.") != -1){
		    return "chrome1";
		}else if( window.devicePixelRatio && window.getMatchedCSSRules && !window.Opera){
			return "safari3";
		}else if (navigator.vendor.indexOf("Apple Computer, Inc.") != -1){
			if (typeof window.XMLHttpRequest != "undefined"){
				return "safari2";
			}
			return "safari1";
		}else if (agent.indexOf("gecko") != -1){
			return "mozilla";
		}
	}
	return false;
}

function osType(){
	var os = navigator.platform;

	os = os.toLowerCase();
	if(os.indexOf("mac") != -1){
		os = "mac";
	}else if(os.indexOf("linux") != -1){
		os = "linux";	
	}else{
		os = "win";	
	}
	return os;
}

/* Replace headlines with Flash Futura font */
function replaceHeading(selector,fgcolor,bgcolor,align) {
	if(typeof sIFR == "function" && browser!="ie6" && browser.indexOf("opera") == -1){
		sIFR.replaceElement(named({sSelector:selector, sFlashSrc:"/swf/futura_md_bt.swf", sColor:fgcolor, sBgColor:bgcolor, sWmode:"transparent", sFlashVars:"textalign="+align}));
	};
}

/* sets jumpto function for drop down onchange, hides Go button and repositions the flag */
function initCountryDropDown() {
	if($("nav_international_select")) {
		Event.observe ("nav_international_select", "change", jumpto)
		var aInput = $$("#footer form input")
		var aImg = $$("#footer form img")
		if(aInput.length > 0) {
			for(var i=0; i < aInput.length; i++) {
				aInput[i].addClassName("hide");
			}
		}
		/*
		if(aImg.length > 0) {
			for(i=0; i < aImg.length; i++) {
				if(aImg[i].src.indexOf("flag") > 0) {
					if(browser!="ie6") {
						aImg[i].style.position = "relative";
						aImg[i].style.left = "-22px";
					} else {
						if($("prodDisplay")) { 
							aImg[i].style.marginLeft = "-22px"; 
						} else {
							aImg[i].style.marginLeft = "0px"; 
						}
					}
					aImg[i].style.marginTop = "2px";
				}
			}
		}
		*/
	}
}
/*  */
function alternateTableRow(id){
	var selector = "#" + id + " tr"
	var rows = $$(selector);	//get all table rows
	for(i = 0; i < rows.length; i++){ doAlternate(rows[i], i); }
}
function doAlternate(row, i){
	if(i % 2 == 0){ row.addClassName("even"); } else { row.addClassName("odd"); }
}

/* Changes all SAFARI 3 text to normal weight and country dropdown text to black */
function unboldSafari() {
	if(browser=="safari3"){
		arrElems = $$("*");
		for(var i=0; i < arrElems.length; i++) {
			arrElems[i].setStyle({ fontWeight: 'normal' });
		}
		if($("nav_international_select")) $("nav_international_select").setStyle({ color: '#000' });
	}
}

/* Accessible way to open page in a new window */
function externalLinks() { 
	if (!document.getElementsByTagName) return; 
	var anchors = document.getElementsByTagName("a"); 
	for (var i=0; i<anchors.length; i++) { 
	
		var anchor = anchors[i]; 
		if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external") 
		anchor.target = "_blank";
	}
}


/* Used for SI Tracking - removes the £ sign */
function formatPrice(strPrice) {
	if(!IsNumeric(Left(strPrice,1))) { strPrice = Right(strPrice,strPrice.length-1); }
	return strPrice;
}

function getPreTaxPrice(strVatPrice) {
	var vatRate = 17.5;
	strVatPrice = formatPrice(strVatPrice);
	var preTaxPrice = (1 / (1+(vatRate / 100))) * strVatPrice;
	preTaxPrice = formatNumber(preTaxPrice,2,' ','.','','','-','');
	return preTaxPrice.toString();
}

// checks if the required version of flash is installed
function hasFlashVersion(iVersion) {
	var flashinstalled = 0;
	var flashversion = 0;
	MSDetect = "false";
	if (navigator.plugins && navigator.plugins.length){
		x = navigator.plugins["Shockwave Flash"];
		if (x) {
			flashinstalled = 2;
			if (x.description) {
			    y = x.description;
			    //Hack for version 10 and above! Will need to be fixed at version 100!
			    if (y.charAt(y.indexOf('.')-2) != " ") {
			        flashversion = y.charAt(y.indexOf('.')-2)
			    }
			    flashversion = flashversion+y.charAt(y.indexOf('.')-1);
			}
		}else flashinstalled = 1;
		if (navigator.plugins["Shockwave Flash 2.0"]) { flashinstalled = 2; flashversion = 2; }
	} else if (navigator.mimeTypes && navigator.mimeTypes.length) {
		x = navigator.mimeTypes['application/x-shockwave-flash'];
		if (x && x.enabledPlugin) flashinstalled = 2;
		else flashinstalled = 1;
	} else MSDetect = "true";
	
	if(flashinstalled==0) {
		try{ var flash = new ActiveXObject("ShockwaveFlash.ShockwaveFlash." + iVersion); flashinstalled = 2; flashversion = iVersion; }
		catch(e){}
	}
	if(flashinstalled!=2) { return false; }
	else {
		if(flashversion < iVersion) { return false; } 
		else { return true; }
	}
}
 
function formatNumber(num,dec,thou,pnt,curr1,curr2,n1,n2) {var x = Math.round(num * Math.pow(10,dec));if (x >= 0) n1=n2='';var y = (''+Math.abs(x)).split('');var z = y.length - dec; if (z<0) z--; for(var i = z; i < 0; i++) y.unshift('0');y.splice(z, 0, pnt); if(y[0] == pnt) y.unshift('0'); while (z > 3) {z-=3; y.splice(z,0,thou);}var r = curr1+n1+y.join('')+n2+curr2;return r;}

/* Redirect to chosen country */
function jumpto() {
    if ($F("nav_international_select") != "") { document.forms.frmLocation.submit(); }
}

function setPostcodeText() {
    if ($("shopPostCodeChecker")) {
        var searchField = $("postcode");
        Event.observe($("postcode"), "click", emptyPostcodeText);
        Event.observe($("postcode"), "blur", emptyPostcodeText);
    }
}

function emptyPostcodeText() {
    var searchField = $("postcode");
    if (searchField.value == "??????") {
        searchField.value = "";
    } else if (searchField.value == "") {
        searchField.value = "??????";
    }
}

Event.observe(window, "load", function () { externalLinks(); unboldSafari(); initCountryDropDown(); setPostcodeText(); });