function imgOver(e) {
//zoek het element waar de event vandaan kwam: is de betreffende tab

if(window.event){
var target = window.event.srcElement;
} else {
var target = e.target;
}
//zoek van deze tab de id
var targetSrc = target.id;
//alert(targetSrc);

	//pas de andere sources van de tabs aan
	var btnMain01 = document.getElementById('Main01');
	var btnMain02 = document.getElementById('Main02');
	var btnMain03 = document.getElementById('Main03');
	var btnMain04 = document.getElementById('Main04');
	var btnMain05 = document.getElementById('Main05');
	var btnMain06 = document.getElementById('Main06');
	var btnMain07 = document.getElementById('Main07');
	var btnMain08 = document.getElementById('Main08');
	var btnNieuwsMain = document.getElementById('NieuwsMain');
	
	//var sub01 = document.getElementById('but01');
	
	if (targetSrc == "Main01" || targetSrc == "butMain01") {
		btnMain01.src = "images/menu/Main01_over.gif"
	} else if (targetSrc == "Main02") {
		btnMain02.src = "images/menu/Main02_over.gif"
	} else if (targetSrc == "Main03") {
		btnMain03.src = "images/menu/Main03_over.gif"
	} else if (targetSrc == "Main04") {
		btnMain04.src = "images/menu/Main04_over.gif"
	} else if (targetSrc == "Main05") {
		btnMain05.src = "images/menu/Main05_over.gif"
	} else if (targetSrc == "Main06") {
		btnMain06.src = "images/menu/Main06_over.gif"
	} else if (targetSrc == "Main07") {
		btnMain07.src = "images/menu/Main07_over.gif"
	} else if (targetSrc == "Main08") {
		btnMain08.src = "images/menu/Main08_over.gif"
	} else if (targetSrc == "NieuwsMain") {
		btnNieuwsMain.src = "images/menu/NieuwsMain_over.gif"
	}
}

function imgNormal(e) {
//zoek het element waar de event vandaan kwam: is de betreffende tab

if(window.event){
var target = window.event.srcElement;
} else {
var target = e.target;
}
//zoek van deze tab de id
var targetSrc = target.id;
//alert(targetSrc);
	//pas de andere sources van de tabs aan
	var btnMain01 = document.getElementById('Main01');
	var btnMain02 = document.getElementById('Main02');
	var btnMain03 = document.getElementById('Main03');
	var btnMain04 = document.getElementById('Main04');
	var btnMain05 = document.getElementById('Main05');
	var btnMain06 = document.getElementById('Main06');
	var btnMain07 = document.getElementById('Main07');
	var btnMain08 = document.getElementById('Main08');
	var btnNieuwsMain = document.getElementById('NieuwsMain');
	if (targetSrc == "Main01") {
		btnMain01.src = "images/menu/Main01.gif"
	} else if (targetSrc == "Main02") {
		btnMain02.src = "images/menu/Main02.gif"
	} else if (targetSrc == "Main03") {
		btnMain03.src = "images/menu/Main03.gif"
	} else if (targetSrc == "Main04") {
		btnMain04.src = "images/menu/Main04.gif"
	} else if (targetSrc == "Main05") {
		btnMain05.src = "images/menu/Main05.gif"
	} else if (targetSrc == "Main06") {
		btnMain06.src = "images/menu/Main06.gif"
	} else if (targetSrc == "Main07") {
		btnMain07.src = "images/menu/Main07.gif"
	} else if (targetSrc == "Main08") {
		btnMain08.src = "images/menu/Main08.gif"
	} else if (targetSrc == "NieuwsMain") {
		btnNieuwsMain.src = "images/menu/NieuwsMain.gif"
	}
	
}


function addListeners(e){
	
	var button01 = document.getElementById('Main01');
	addEvent(button01, 'mouseover', imgOver, false);
	addEvent(button01, 'mouseout', imgNormal, false);
	
	var button02 = document.getElementById('Main02');
	addEvent(button02, 'mouseover', imgOver, false);
	addEvent(button02, 'mouseout', imgNormal, false);
	
	var button03 = document.getElementById('Main03');
	addEvent(button03, 'mouseover', imgOver, false);
	addEvent(button03, 'mouseout', imgNormal, false);
	
	var button04 = document.getElementById('Main04');
	addEvent(button04, 'mouseover', imgOver, false);
	addEvent(button04, 'mouseout', imgNormal, false);
	
	var button05 = document.getElementById('Main05');
	addEvent(button05, 'mouseover', imgOver, false);
	addEvent(button05, 'mouseout', imgNormal, false);
	
	var button06 = document.getElementById('Main06');
	addEvent(button06, 'mouseover', imgOver, false);
	addEvent(button06, 'mouseout', imgNormal, false);
	
	var button07 = document.getElementById('Main07');
	addEvent(button07, 'mouseover', imgOver, false);
	addEvent(button07, 'mouseout', imgNormal, false);
	
	var button08 = document.getElementById('Main08');
	addEvent(button08, 'mouseover', imgOver, false);
	addEvent(button08, 'mouseout', imgNormal, false);
	
	var button08 = document.getElementById('NieuwsMain');
	addEvent(button08, 'mouseover', imgOver, false);
	addEvent(button08, 'mouseout', imgNormal, false);
	
	var sub01 = document.getElementById('butMain01');
	addEvent(sub01, 'mouseover', imgOver, false);
	addEvent(sub01, 'mouseout', imgNormal, false);

}


//window.addEventListener('load', addListeners, false);
addEvent(window, 'load', addListeners, false);

function addEvent(elm, evType, fn, useCapture)
      // cross-browser event handling for IE5+, NS6+ and Mozilla/Gecko
      // By Scott Andrew
      {
        if (elm.addEventListener) {
          elm.addEventListener(evType, fn, useCapture); 
          return true; 
        } else if (elm.attachEvent) {
          var r = elm.attachEvent('on' + evType, fn); 
          return r; 
        } else {
          elm['on' + evType] = fn;
        }
      }