if (document.images)
   {
     // de plaatjes pre-laden
     nluit = new Image();
     nluit.src = "images/nederlands_out.jpg";
     nlaan = new Image();
     nlaan.src = "images/nederlands_over.jpg";

     fruit = new Image();
     fruit.src = "images/frans_out.jpg";
     fraan = new Image();
     fraan.src = "images/frans_over.jpg";

     deuit = new Image();
     deuit.src = "images/duits_out.jpg";
     deaan = new Image();
     deaan.src = "images/duits_over.jpg";

     enuit = new Image();
     enuit.src = "images/engels_out.jpg";
     enaan = new Image();
     enaan.src = "images/engels_over.jpg";
   }
// de daadwerkelijke functies
function afbeeldingaan(naam)
  { if (document.images)
       { tekstaannaam = eval(naam + "aan.src");
         document.images[naam].src = tekstaannaam;
       }
  }
function afbeeldinguit(naam)
  { if (document.images)
       { tekstuitnaam = eval(naam + "uit.src");
         document.images[naam].src = tekstuitnaam;
       } 
  }
// Klaar met verbergen -->
function display(element){
		document.getElementById(element).style.display = "list-item";
	}
function hide(element){
		document.getElementById(element).style.display = "none";
	}
function Browser() {var ua,s,i;this.isIE=false;this.isNS=false;this.version=null;
ua = navigator.userAgent;s="MSIE";if((i=ua.indexOf(s))>=0){this.isIE=true;
this.version=parseFloat(ua.substr(i + s.length));return;}s="Netscape6/";
if((i=ua.indexOf(s))>=0){this.isNS=true;this.version=parseFloat(ua.substr(i+s.length));
return;}s="Gecko";if((i=ua.indexOf(s))>=0){this.isNS=true;this.version=6.1;
return;}}var browser=new Browser();var activeButton=null;
if(browser.isIE)document.onmousedown=pageMousedown;
else document.addEventListener("mousedown",pageMousedown,true);
function pageMousedown(event){var el;if(activeButton==null)return;
if(browser.isIE)el=window.event.srcElement;
else el=(event.target.tagName?event.target:event.target.parentNode);
if(el== activeButton)return;
if(getContainerWith(el,"DIV","menu")==null){resetButton(activeButton);activeButton = null;
}}
function buttonClick(event,menuId){var button;
if(browser.isIE)button=window.event.srcElement;
else button=event.currentTarget;button.blur();
if(button.menu==null){button.menu = document.getElementById(menuId);
if(button.menu.isInitialized==null)menuInit(button.menu);}
if(activeButton!=null)resetButton(activeButton);
if(button!=activeButton){depressButton(button);activeButton = button;}
elseactiveButton=null;return false;}
function buttonMouseover(event, menuId){var button;
if(browser.isIE)button=window.event.srcElement;else button=event.currentTarget;
if(activeButton!=null&&activeButton!=button)buttonClick(event, menuId);}
function depressButton(button){var x,y;button.className+=" WinKnopActive";
x=getPageOffsetLeft(button);y=getPageOffsetTop(button)+ button.offsetHeight;
if (browser.isIE){x+=button.offsetParent.clientLeft;
y+=button.offsetParent.clientTop;}
button.menu.style.left=x+"px";button.menu.style.top=y+"px";
button.menu.style.visibility="visible";}
function resetButton(button){removeClassName(button,"WinKnopActive");
if(button.menu!=null){closeSubMenu(button.menu);button.menu.style.visibility="hidden";}}
function menuMouseover(event){var menu;
if(browser.isIE)menu=getContainerWith(window.event.srcElement,"DIV","menu");
else menu=event.currentTarget;if(menu.activeItem!=null)closeSubMenu(menu);}
function WinItemMouseover(event,menuId){var item,menu,x,y;
if(browser.isIE)item=getContainerWith(window.event.srcElement,"A","WinItem");
else item=event.currentTarget;menu=getContainerWith(item,"DIV","menu");
if(menu.activeItem!=null)closeSubMenu(menu);menu.activeItem=item;
item.className+=" WinItemOplichten";
if(item.subMenu==null){item.subMenu=document.getElementById(menuId);
if(item.subMenu.initialized==null)menuInit(item.subMenu);}
x=getPageOffsetLeft(item)+item.offsetWidth;y=getPageOffsetTop(item);var maxX,maxY;
if(browser.isNS){maxX=window.scrollX+window.innerWidth;
maxY=window.scrollY+window.innerHeight;}
if(browser.isIE){maxX=(document.documentElement.scrollLeft!=0? 
document.documentElement.scrollLeft:document.body.scrollLeft)
+(document.documentElement.clientWidth!=0? 
document.documentElement.clientWidth:document.body.clientWidth);
maxY=(document.documentElement.scrollTop!=0? 
document.documentElement.scrollTop:document.body.scrollTop)
+(document.documentElement.clientHeight!=0? 
document.documentElement.clientHeight:document.body.clientHeight);}
maxX-=item.subMenu.offsetWidth;maxY-=item.subMenu.offsetHeight;
if(x>maxX)x=Math.max(0,x-item.offsetWidth-item.subMenu.offsetWidth
+(menu.offsetWidth-item.offsetWidth));y=Math.max(0,Math.min(y, maxY));
item.subMenu.style.left=x+"px";item.subMenu.style.top=y+"px";
item.subMenu.style.visibility="visible";
if(browser.isIE)window.event.cancelBubble=true;else event.stopPropagation();}
function closeSubMenu(menu){if(menu==null||menu.activeItem==null)return;
if(menu.activeItem.subMenu!=null){closeSubMenu(menu.activeItem.subMenu);
menu.activeItem.subMenu.style.visibility="hidden";menu.activeItem.subMenu=null;}
removeClassName(menu.activeItem,"WinItemOplichten");menu.activeItem=null;}
function menuInit(menu){
var itemList,spanList;var textEl,pijltjeEl;var itemWidth;var w,dw;var i,j;
if(browser.isIE){menu.style.lineHeight="2.5ex";
spanList=menu.getElementsByTagName("SPAN");
for(i=0;i< spanList.length; i++)
if(hasClassName(spanList[i],"WinItempijltje")){
spanList[i].style.fontFamily="Webdings";spanList[i].firstChild.nodeValue="4";}}
itemList=menu.getElementsByTagName("A");
if(itemList.length>0)itemWidth=itemList[0].offsetWidth;else return;
for(i=0; i < itemList.length; i++) {
spanList=itemList[i].getElementsByTagName("SPAN")
textEl=null
pijltjeEl = null;
for(j=0; j < spanList.length; j++) {
if(hasClassName(spanList[j],"WinItemText"))textEl=spanList[j];
if(hasClassName(spanList[j],"WinItempijltje"))pijltjeEl=spanList[j];}
if(textEl!=null&&pijltjeEl!=null)
textEl.style.paddingRight=(itemWidth-(textEl.offsetWidth+pijltjeEl.offsetWidth))+"px";}
if (browser.isIE){w=itemList[0].offsetWidth;
itemList[0].style.width=w+"px";dw=itemList[0].offsetWidth-w;w-=dw;
itemList[0].style.width=w+"px";}
menu.initialized=true;}
function getContainerWith(node,tagName,className){
while(node!=null){
if(node.tagName!=null&&node.tagName==tagName&&hasClassName(node,className))
return node;node=node.parentNode;}return node;}
function hasClassName(el,name){
var i,list;list=el.className.split(" ");
for(i=0;i<list.length;i++)if(list[i]==name)return true;return false;}
function removeClassName(el,name){
var i,curList,newList;if(el.className==null)return;
newList=new Array();curList=el.className.split(" ");
for(i=0;i<curList.length;i++)
if(curList[i]!=name)newList.push(curList[i]);el.className=newList.join(" ");}
function getPageOffsetLeft(el){var x;x=el.offsetLeft;
if(el.offsetParent!=null)x+=getPageOffsetLeft(el.offsetParent);return x;}
function getPageOffsetTop(el){var y;y=el.offsetTop;
if(el.offsetParent!=null)y+=getPageOffsetTop(el.offsetParent);return y;}

var win=null;
function NewWindow(mypage,myname,w,h,pos,infocus){
if(pos=="random"){myleft=(screen.width)?Math.floor(Math.random()*(screen.width-w)):100;mytop=(screen.height)?Math.floor(Math.random()*((screen.height-h)-75)):100;}
if(pos=="center"){myleft=(screen.width)?(screen.width-w)/2:100;mytop=(screen.height)?(screen.height-h)/2:100;}
else if((pos!='center' && pos!="random") || pos==null){myleft=0;mytop=20}
settings="width=" + w + ",height=" + h + ",top=" + mytop + ",left=" + myleft + ",scrollbars=yes,location=no,directories=no,status=no,menubar=no,toolbar=yes,resizable=no";win=window.open(mypage,myname,settings);
win.focus();}

//detect browser:
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 3) browserVer = "1";
else if (browserName == "Microsoft Internet Explorer" && browserVer == 4) browserVer = "1";
else browserVer = "2";

//preload images:
if (browserVer == 1) {
a1 = new Image(200,150);
a1.src = "/images/grondwerken.jpg";
a2 = new Image(200,150);
a2.src = "/images/grondwerken_nl_over.jpg";
a3 = new Image(200,150);
a3.src = "/images/grondwerken_fr_over.jpg";
a4 = new Image(200,150);
a4.src = "/images/grondwerken_de_over.jpg";
a5 = new Image(200,150);
a5.src = "/images/grondwerken_en_over.jpg";
b1 = new Image(200,150);
b1.src = "/images/waterwerken.jpg";
b2 = new Image(200,150);
b2.src = "/images/waterwerken_nl_over.jpg";
b3 = new Image(200,150);
b3.src = "/images/waterwerken_fr_over.jpg";
b4 = new Image(200,150);
b4.src = "/images/waterwerken_de_over.jpg";
b5 = new Image(200,150);
b5.src = "/images/waterwerken_en_over.jpg";
c1 = new Image(200,150);
c1.src = "/images/opslag.jpg";
c2 = new Image(200,150);
c2.src = "/images/opslag_nl_over.jpg";
c3 = new Image(200,150);
c3.src = "/images/opslag_fr_over.jpg";
c4 = new Image(200,150);
c4.src = "/images/opslag_de_over.jpg";
c5 = new Image(200,150);
c5.src = "/images/opslag_en_over.jpg";
d1 = new Image(200,150);
d1.src = "/images/landbouw.jpg";
d2 = new Image(200,150);
d2.src = "/images/landbouw_nl_over.jpg";
d3 = new Image(200,150);
d3.src = "/images/landbouw_fr_over.jpg";
d4 = new Image(200,150);
d4.src = "/images/landbouw_de_over.jpg";
d5 = new Image(200,150);
d5.src = "/images/landbouw_en_over.jpg";
e1 = new Image(200,150);
e1.src = "/images/spoorwegwerken.jpg";
e2 = new Image(200,150);
e2.src = "/images/spoorwegwerken_nl_over.jpg";
e3 = new Image(200,150);
e3.src = "/images/spoorwegwerken_fr_over.jpg";
e4 = new Image(200,150);
e4.src = "/images/spoorwegwerken_de_over.jpg";
e5 = new Image(200,150);
e5.src = "/images/spoorwegwerken_en_over.jpg";
f1 = new Image(200,150);
f1.src = "/images/maatwerk.jpg";
f2 = new Image(200,150);
f2.src = "/images/maatwerk_nl_over.jpg";
f3 = new Image(200,150);
f3.src = "/images/maatwerk_fr_over.jpg";
f4 = new Image(200,150);
f4.src = "/images/maatwerk_de_over.jpg";
f5 = new Image(200,150);
f5.src = "/images/maatwerk_en_over.jpg";
g1 = new Image(200,150);
g1.src = "/images/muleby-silo.jpg";
g2 = new Image(200,150);
g2.src = "/images/muleby-silo_nl_over.jpg";
g3 = new Image(200,150);
g3.src = "/images/muleby-silo_fr_over.jpg";
g4 = new Image(200,150);
g4.src = "/images/muleby-silo_de_over.jpg";
g5 = new Image(200,150);
g5.src = "/images/muleby-silo_en_over.jpg";
}

//image swapping function:
function hiLite(imgDocID, imgObjName, comment) {
if (browserVer == 1) {
document.images[imgDocID].src = eval(imgObjName + ".src");
window.status = comment; return true;
}}

var timeDelay = 3;
var Pix = new Array("/images/img_001.jpg","/images/img_002.jpg","/images/img_003.jpg","/images/img_004.jpg","/images/img_005.jpg","/images/img_006.jpg","/images/img_007.jpg","/images/img_008.jpg","/images/img_009.jpg","/images/img_010.jpg","/images/img_011.jpg","/images/img_012.jpg","/images/img_013.jpg","/images/img_014.jpg","/images/img_015.jpg");
var howMany = Pix.length;
timeDelay *= 1000;
var PicCurrentNum = 0;
var PicCurrent = new Image();
PicCurrent.src = Pix[PicCurrentNum];
function startPix() {
setInterval("slideshow()", timeDelay);
}
function slideshow() {
PicCurrentNum++;
if (PicCurrentNum == howMany) {
PicCurrentNum = 0;
}
PicCurrent.src = Pix[PicCurrentNum];
document["changingpix"].src = PicCurrent.src;
}