function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}

function comportamientos()
{
	if(document.getElementById('imagen')) document.getElementById('imagen').onclick = function() { ampliar(this); }
	if(document.getElementById('ampliar')) document.getElementById('ampliar').onclick = function() { ampliar(document.getElementById('imagen')); }
	if(document.getElementById('ampliada')) document.getElementById('ampliada').onclick = function() { this.style.visibility="hidden"; }
	if(document.getElementById('formulario')) document.getElementById('formulario').onsubmit = function() { return false; }
	if(document.getElementById('enviar')) document.getElementById('enviar').onclick = function() { validar(); }
	if (!document.getElementsByTagName) return false;
	var spans = document.getElementsByTagName("span");
	for (var i=0; i < spans.length; i++)
	{
		if (spans[i].id.match("toggle"))
		{
			spans[i].onclick = function()
			{
				var str = this.id;
				var len = this.id.length - 1;
				toggle(document.getElementById('spot'+str.substr(len,1)));
			}
		}
	}
	hideall(document.getElementsByTagName("div"));
}

function scroller()
{
	var scroll = new Fx.Scroll('scroll', {
		wait: false,
		duration: 500,
		offset: {'x': -200, 'y': -50},
		transition: Fx.Transitions.Quad.easeInOut
	});

	var vidn = "foto";
	var vini = 4;
	var imgs = document.getElementsByTagName("img");
	var pics = new Array();
	for (var i=0, j=0; i < imgs.length; i++)
		if(imgs[i].id.match(vidn))
			pics[j++] = imgs[i];
	if(pics.length<4)
		vini = pics.length;
	var velm = vini;

	if($('prev'))
	{
		if(pics.length==0) document.getElementById('prev').style.display='none';
		$('prev').addEvent('click', function(event)
		{
			event = new Event(event).stop();
			if($(vidn+(velm-1)) == null || velm <= vini)
			{
				velm = vini;
				scroll.toElement(vidn+velm);
			}
			else
			{
				velm--;
				scroll.toElement(vidn+velm);
			}
		});
	}

	if($('next'))
	{
		if(pics.length==0) document.getElementById('next').style.display='none';
		$('next').addEvent('click', function(event)
		{
			event = new Event(event).stop();
			if($(vidn+(velm+1)) == null)
			{
				velm = pics.length + 1;
				scroll.toElement('last');
			}
			else
			{
				velm++;
				scroll.toElement(vidn+velm);
			}
		});
	}
}

var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};
BrowserDetect.init();
addLoadEvent(comportamientos);
addLoadEvent(scroller);