// http://www.dustindiaz.com/top-ten-javascript/ 

Array.prototype.push = function(value) {
  this[this.length] = value;
}

function toggleHTML(textid,f,s){
	var tgo = document.getElementById(textid);
	if(tgo.innerHTML != s){
		tgo.innerHTML =s;
	}else{
		tgo.innerHTML =f;
	}
}

function getElementsByClassName(className, parentElement) {
  var children = ($(parentElement) || document.body).getElementsByTagName('*');
  return $A(children).inject([], function(elements, child) {
    if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
      elements.push(child);
    return elements;
  });
}

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\s)'+searchClass+'(\\s|$)');
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

function togIm(imId,o,n) {
	var tgo = document.getElementById(imId);
	var path = 'http://tibet.prm.ox.ac.uk/';
	if ( tgo.src != path+'graphics/'+o ) {
		tgo.src = path+'graphics/'+o;
	}else {
		tgo.src = path+'graphics/'+n;
	}
}

function swIm(imId,n) {
	var tgo = document.getElementById(imId);
	var path = 'http://tibet.prm.ox.ac.uk/';
	if ( tgo.src != path+'graphics/'+n ) {
		tgo.src = path+'graphics/'+n;
	}
}

function toggleImage(obj , jpgfile) {
	var tgo = document.getElementById(obj);
	var path = 'http://tibet.prm.ox.ac.uk/photos/';
	if ( tgo.src != path+'opt/95/'+jpgfile ) {
		tgo.src = path+'opt/95/'+jpgfile;
	}else {
		tgo.src = path+'opt/300/'+jpgfile;
	}
}

function toggleRawImage(obj , jpgfile) {
	var tgr = document.getElementById(obj);
	var path = 'http://tibet.prm.ox.ac.uk/photos/';
	if ( tgr.src != path+'raw/95/'+jpgfile ) {
		tgr.src = path+'raw/95/'+jpgfile;
	}else {
		tgr.src = path+'raw/400/'+jpgfile;
	}
}

function toggleText() {
	a=toggleText.arguments;
	for(i=0; i<a.length; i++){
		if(tt = document.getElementById(a[i])){
		  if ( tt.style.display != 'none' ) {
			tt.style.display = 'none';
		  }else {
			tt.style.display = 'block';
		  }
		}
	}
}

function toggleStyle(n,s,y) {
// will toggle the class of element of id (n) between 2 styles s & y
	if(tt = document.getElementById(n)){
		if ( tt.className != y ) {
			tt.className = y;
		  }else {
			tt.className = s;
		  }
		
	}
}

// http://www.bigbold.com/snippets/posts/show/1596 

function compareImage(imType , imageFile){
var path = 'http://tibet.prm.ox.ac.uk/photos/';
var blnDOMSUPPORT = (document.getElementById) ? true : false;
	if ( blnDOMSUPPORT ){
		var el = document.getElementById('toCompare');
		var imgNew = document.createElement('img');
		//el.src = path+imType+'/400/'+imageFile;
		imgNew.src = path+imType+'/400/'+imageFile;
		imgNew.id = 'toCompare';
		var divParent;
		divParent = el.parentNode;
		divParent.replaceChild(imgNew, el);
	}else{
		document.images['toCompare'].src = path+imType+'/400/'+imageFile;
	}
}


function getCookie(Name) {
	var search = Name + "="
		if (document.cookie.length > 0) { // if there are any cookies
			offset = document.cookie.indexOf(search) 
			if (offset != -1) { // if cookie exists 
				offset += search.length 
				// set index of beginning of value
				end = document.cookie.indexOf(";", offset) 
				// set index of end of cookie value
				if (end == -1) 
					end = document.cookie.length
				return unescape(document.cookie.substring(offset, end))
			} 
		}
}

function setCookie(value) {
	var today = new Date();
	var expire = new Date();
	expire.setTime(today.getTime() + 60*60*24*30);
	lastCookie = getCookie('myalbum');
	document.cookie = "myalbum=" +lastCookie +"~"+ escape(value) + ((expire == null) ? "" : ("; expires=" + expire.toGMTString()));
}

//my album javascript

function saveAnotationCookie(head,value) {
// save any annotations head is the heading (accn number or notes or title) value is whatever user enters in form 
	var today = new Date();
	var expire = new Date();
	expire.setTime(today.getTime() + 60*60*24*30);
	document.cookie = head+"=" + escape(value) + ((expire == null) ? "" : ("; expires=" + expire.toGMTString()));
}

function saveAlbum(){
     if(document.myform.updateBut.value != 'updating' ){
     toSave = getElementsByClass('userform');
          for (var i in toSave) {
                    saveAnotationCookie(toSave[i].name,toSave[i].value)
          }
    }
}

function deleteCookie( name, path, domain ) {
	if ( getCookie( name ) ) document.cookie = name + '=' +
			( ( path ) ? ';path=' + path : '') +
			( ( domain ) ? ';domain=' + domain : '' ) +
			';expires=Thu, 01-Jan-1970 00:00:01 GMT';
}