var randomImages = new Array(4);
var numberOfRandomImages = 4;


	randomImages[1 - 1] = '/internationalisering/dsresource?objectid=25865';

	randomImages[2 - 1] = '/internationalisering/dsresource?objectid=26010';

	randomImages[3 - 1] = '/internationalisering/dsresource?objectid=26011';

	randomImages[4 - 1] = '/internationalisering/dsresource?objectid=26012';


var transitionDuration;

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();

function startRandomization(){

	//Geen overgang in IE6
	if(BrowserDetect.browser == "Explorer" && BrowserDetect.version<7){

				transitionDuration = '0.0';
	}else{
					transitionDuration = '0.5';
	}
		$('header').update('<div class="random_afbeelding_inside" id="randomImage'+0+'" style="display:block; background-image:url(' + randomImages[0] + ')"></div>' + $('header').innerHTML);
	
		for(i = 1;i<4;i++){
			$('header').update('<div class="random_afbeelding_inside" id="randomImage'+i+'" style="display:none; background-image:url(' + randomImages[i] + ')"></div>' + $('header').innerHTML);
		}


		setTimeout("Effect.toggle(\'randomImage"+(numberOfRandomImages -1)+"\')",700*(numberOfRandomImages-1));
		changeImage(-1);
	
}

function changeImage(number){
	//RANDOM DIV numberOfRandomImages -1 moet niet in de cycle opgenomen worden
	number = number % (numberOfRandomImages);

		
	
	if(number == -1){
		//ZET ALLE DIVS UIT (BEHALVE DIEGENE DIE NIET IN DE CYCLE ZIT
		
		Effect.Appear($('randomImage0'),{duration:transitionDuration});

		for(i = 1;i<numberOfRandomImages -1;i++){
			setTimeout("Effect.Appear(\'"+('randomImage'+i) +"\',{to:1.0, duration:0.0})", i *700);
		}
		setTimeout ( "new function(){changeImage("+(number + 1)+");}", 
				3000
			 );
	}
	else{
		Effect.Fade('randomImage'+number,{to:0.01, duration:transitionDuration});
		if(number + 1 < numberOfRandomImages -1){
			setTimeout ( "new function(){changeImage("+(number + 1)+");}", 
				3000
			 );
		}else{
			setTimeout ( "new function(){changeImage("+(-1)+");}", 
				3000
			 );
		}
	}
}