// JavaScript Document

//Función genérica para escribir cookies
function SetCookie(cookieName,cookieValue,nDays) {
 var today = new Date();
 var expire = new Date();
 if (nDays==null || nDays==0) nDays=1;
 expire.setTime(today.getTime() + 3600000*24*nDays);
 document.cookie = cookieName+"="+escape(cookieValue)
                 + ";expires="+expire.toGMTString()+';path=/'
;
}
//Función genérica para destruir cookies
function DestroyCookie(cookieName) {
 var today = new Date();
 var expire = new Date();
 var nDays = 365;
 expire.setTime(today.getTime() - 3600000*24*nDays);
 document.cookie = cookieName+"="+''
                 + ";expires="+expire.toGMTString()+';path=/';
}

//Función genérica para obtener los ids de una determinada clase
/*
	Developed by Robert Nyman, http://www.robertnyman.com
	Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/
var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};


var defaultFontSize = 3;
var FontSize = defaultFontSize;
var minFontSize = 2;
var maxFontSize = 4;
var divTxt;
    
//Aumenta el tamaño de la letra
function enlargeFont() {
	if (FontSize < maxFontSize) {
    FontSize += 1;
	//Buscar todos los elementos con clase 2, 3 y 4
	var elementos = getElementsByClassName("text2");
	if(elementos.length == 0){var elementos = getElementsByClassName("text3");}
	if(elementos.length == 0){var elementos = getElementsByClassName("text4");}
	for ( var i in elementos )
		{
			var elemento =  elementos[i];
			elemento.className = 'text' + FontSize;
		}//endfor
	DestroyCookie('dc_font_size');//Destruir cookie anterior
	SetCookie('dc_font_size','text' + FontSize,365);//Escribir cookie nueva
	}//endif
}
//Disminuye el tamaño de la letra
function reduceFont() {
	if (FontSize > minFontSize) {
    FontSize -= 1;
	//Buscar todos los elementos con clase 2, 3 y 4
	var elementos = getElementsByClassName("text4");
	if(elementos.length == 0){var elementos = getElementsByClassName("text3");}
	if(elementos.length == 0){var elementos = getElementsByClassName("text2");}
	for ( var i in elementos )
		{
			var elemento =  elementos[i];
			elemento.className = 'text' + FontSize;
		}//endfor
	DestroyCookie('dc_font_size');//Destruir cookie anterior
	SetCookie('dc_font_size','text' + FontSize,365);//Escribir cookie nueva
    }
}

//Determina la resolución de pantalla
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}
	
	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

//Muestra u oculta el overlay de log-in
function switchOverlay() {

	var overlay = document.getElementById("overlay");
	
	if (overlay.style.visibility == 'visible') {
		
		overlay.style.visibility = 'hidden';

	} else if (overlay.style.visibility == 'hidden') {

		arrayPageSize = getPageSize();

		overlay.style.visibility = 'visible';
		overlay.style.height = arrayPageSize[1]+"px";

	}

}

//Muestra la ventana contenedora de la capa de log-in
function switchMessageWindow(size, top, id) {
	
	if (typeof size == "undefined") {
		size = "500";
	}
	if (typeof top == "undefined") {
		top = "70";
	}
	
	var arrayPageSize = getPageSize();
	//var margen = arrayPageSize[1] - top;
	
	switch (id){
		case 'loginwindow':
			var selectedwindow = document.getElementById("loginwindowcontainer");
			var destino = document.getElementById("loginwindow");
			selectedwindow.style.top = top+"px";
			break;
		case 'photowindow':
			var selectedwindow = document.getElementById("photowindowcontainer");	
			var destino = document.getElementById("photowindow");
			selectedwindow.style.top = top+"px";
			break;
	}
	
	if (selectedwindow.style.visibility == 'visible') {
		selectedwindow.style.visibility = 'hidden';
	} else if (selectedwindow.style.visibility == 'hidden') {
		destino.style.width	= size + 'px';
		selectedwindow.style.visibility = 'visible';
	}
}