/* 
 * Cross-browser event handling, by Scott Andrew
 */
function addEvent(element, eventType, lamdaFunction, useCapture) {
    if (element.addEventListener) {
        element.addEventListener(eventType, lamdaFunction, useCapture);
        return true;
    } else if (element.attachEvent) {
        var r = element.attachEvent('on' + eventType, lamdaFunction);
        return r;
    } else {
        return false;
    }
}

/* 
 * Kills an event's propagation and default action
 */
function knackerEvent(eventObject) {
    if (eventObject && eventObject.stopPropagation) {
        eventObject.stopPropagation();
    }
    if (window.event && window.event.cancelBubble ) {
        window.event.cancelBubble = true;
    }
    
    if (eventObject && eventObject.preventDefault) {
        eventObject.preventDefault();
    }
    if (window.event) {
        window.event.returnValue = false;
    }
}

/* 
 * Safari doesn't support canceling events in the standard way, so we must
 * hard-code a return of false for it to work.
 */
function cancelEventSafari() {
    return false;        
}

/* 
 * Cross-browser style extraction, from the JavaScript & DHTML Cookbook
 * <http://www.oreillynet.com/pub/a/javascript/excerpt/JSDHTMLCkbk_chap5/index5.html>
 */
function getElementStyle(elementID, CssStyleProperty) {
    var element = document.getElementById(elementID);
    if (element.currentStyle) {
        return element.currentStyle[toCamelCase(CssStyleProperty)];
    } else if (window.getComputedStyle) {
        var compStyle = window.getComputedStyle(element, '');
        return compStyle.getPropertyValue(CssStyleProperty);
    } else {
        return '';
    }
}

/* 
 * CamelCases CSS property names. Useful in conjunction with 'getElementStyle()'
 * From <http://dhtmlkitchen.com/learn/js/setstyle/index4.jsp>
 */
function toCamelCase(CssProperty) {
    var stringArray = CssProperty.toLowerCase().split('-');
    if (stringArray.length == 1) {
        return stringArray[0];
    }
    var ret = (CssProperty.indexOf("-") == 0)
              ? stringArray[0].charAt(0).toUpperCase() + stringArray[0].substring(1)
              : stringArray[0];
    for (var i = 1; i < stringArray.length; i++) {
        var s = stringArray[i];
        ret += s.charAt(0).toUpperCase() + s.substring(1);
    }
    return ret;
}

/*
 * Disables all 'test' links, that point to the href '#', by Ross Shannon
 */
function disableTestLinks() {
  var pageLinks = document.getElementsByTagName('a');
  for (var i=0; i<pageLinks.length; i++) {
    if (pageLinks[i].href.match(/[^#]#$/)) {
      addEvent(pageLinks[i], 'click', knackerEvent, false);
    }
  }
}

/* 
 * Cookie functions
 */
function createCookie(name, value, days) {
    var expires = '';
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days*24*60*60*1000));
        var expires = '; expires=' + date.toGMTString();
    }
    document.cookie = name + '=' + value + expires + '; path=/';
}

function readCookie(name) {
    var cookieCrumbs = document.cookie.split(';');
    var nameToFind = name + '=';
    for (var i = 0; i < cookieCrumbs.length; i++) {
        var crumb = cookieCrumbs[i];
        while (crumb.charAt(0) == ' ') {
            crumb = crumb.substring(1, crumb.length); /* delete spaces */
        }
        if (crumb.indexOf(nameToFind) == 0) {
            return crumb.substring(nameToFind.length, crumb.length);
        }
    }
    return null;
}

function eraseCookie(name) {
    createCookie(name, '', -1);
}

/*
 * Author: Rob Reid
 * CreateDate: 20-Mar-09
 * Description: Little helper function to return details about IE 8 and its various compatibility settings either use as it is
 * or incorporate into a browser object. Remember browser sniffing is not the best way to detect user-settings as spoofing is
 * very common so use with caution.
*/
function IEVersion(){
	var _n=navigator,_w=window,_d=document;
	var version="NA";
	var na=_n.userAgent;
	var ieDocMode="NA";
	var ie8BrowserMode="NA";
	// Look for msie and make sure its not opera in disguise
	if(/msie/i.test(na) && (!_w.opera)){
		// also check for spoofers by checking known IE objects
		if(_w.attachEvent && _w.ActiveXObject){		
			// Get version displayed in UA although if its IE 8 running in 7 or compat mode it will appear as 7
			version = (na.match( /.+ie\s([\d.]+)/i ) || [])[1];
			// Its IE 8 pretending to be IE 7 or in compat mode		
			if(parseInt(version)==7){				
				// documentMode is only supported in IE 8 so we know if its here its really IE 8
				if(_d.documentMode){
					version = 8; //reset? change if you need to
					// IE in Compat mode will mention Trident in the useragent
					if(/trident\/\d/i.test(na)){
						ie8BrowserMode = "Compat Mode";
					// if it doesn't then its running in IE 7 mode
					}else{
						ie8BrowserMode = "IE 7 Mode";
					}
				}
			}else if(parseInt(version)==8){
				// IE 8 will always have documentMode available
				if(_d.documentMode){ ie8BrowserMode = "IE 8 Mode";}
			}
			// If we are in IE 8 (any mode) or previous versions of IE we check for the documentMode or compatMode for pre 8 versions			
			ieDocMode = (_d.documentMode) ? _d.documentMode : (_d.compatMode && _d.compatMode=="CSS1Compat") ? 7 : 5;//default to quirks mode IE5				   			
		}
	}
				 
	return {
		"UserAgent" : na,
		"Version" : version,
		"BrowserMode" : ie8BrowserMode,
		"DocMode": ieDocMode
	}			
}