var mousefollow=true;                                            
var dofade=true;       
var centertext=false;  
var xoffset=9;         
var yoffset=25;         

function altProps(){
this.ns4=(navigator.appName.indexOf("Netscape")>=0 && !document.getElementById)? true : false;
this.ie4=(document.all && !document.getElementById)? true : false;
this.ie5=(document.getElementById && document.all)? true : false;
this.ns6=(document.getElementById && navigator.appName.indexOf("Netscape")>=0 )? true: false;
this.w3c=(document.getElementById)? true : false;
this.w_y=0;
this.w_x=0;
this.navtxt=0;
this.boxheight=0;
this.boxwidth=0;
this.ishover=false;
this.isloaded=false;
this.ieop=0;
this.op_id=0;
this.oktomove=false;
}

function toggle_centertext(){
centertext=!centertext;
AT.navtxt.style.textAlign=((AT.w3c || AT.ie4) && centertext)?"center" : "left";
}

function toggle_mousefollow(){
mousefollow=!mousefollow;
}

function toggle_dofade(){
dofade=!dofade;
if(!dofade)AT.ieop=5000;
}

var AT=new altProps();

function getwindowdims(){
AT.w_y=(AT.ie5||AT.ie4)?document.body.clientHeight:window.innerHeight;
AT.w_x=(AT.ie5||AT.ie4)?document.body.clientWidth:window.innerWidth;
}

function getboxwidth(){
if(AT.ns4)AT.boxwidth=(AT.navtxt.document.width)? AT.navtxt.document.width : AT.navtxt.clip.width;
else if(AT.ie4)AT.boxwidth=(AT.navtxt.style.pixelWidth)? AT.navtxt.style.pixelWidth : AT.navtxt.offsetWidth;
else AT.boxwidth=(AT.navtxt.style.width)? parseInt(AT.navtxt.style.width) : parseInt(AT.navtxt.offsetWidth);
}

function getboxheight(){
if(AT.ns4)AT.boxheight=(AT.navtxt.document.height)? AT.navtxt.document.height : AT.navtxt.clip.height;
else if(AT.ie4)AT.boxheight=(AT.navtxt.style.pixelHeight)? AT.navtxt.style.pixelHeight : AT.navtxt.offsetHeight;
else AT.boxheight=parseInt(AT.navtxt.offsetHeight);
}

function movenavtxt(x,y){
if(AT.ns4)AT.navtxt.moveTo(x,y);
else{
AT.navtxt.style.left=x+'px';
AT.navtxt.style.top=y+'px';
}}

function getpagescrolly(){
if(AT.ie5||AT.ie4)return document.body.scrollTop;
else return window.pageYOffset;
}

function getpagescrollx(){
if(AT.ie5||AT.ie4)return document.body.scrollLeft;
else return window.pageXOffset;
}

function writeindiv(text){
if(AT.ns4){
AT.navtxt.document.open();
AT.navtxt.document.write(text);
AT.navtxt.document.close();
}
else AT.navtxt.innerHTML=text;
}

function writetxt(text,col){
if(AT.isloaded){
if(text!=0){
AT.oktomove=true;
AT.ishover=true;
if(AT.ns4)text='<div class="navtext">'+((centertext)?'<center>':'')+text+((centertext)?'</center>':'')+'</div>';
writeindiv(text);
if(AT.ns4)AT.navtxt.visibility="show";
else{
AT.navtxt.style.visibility="visible";
AT.navtxt.style.display="block";
}
getboxheight();
if((AT.w3c || AT.ie4) && dofade){
if(AT.ie4||AT.ie5)AT.navtxt.style.filter="alpha(opacity=0)";
if(AT.ns6)AT.navtxt.style.MozOpacity=0;
AT.ieop=0;
AT.op_id=setInterval('incropacity()',50);
}}else{
if(AT.ns4)AT.navtxt.visibility="hide";
else{
if(dofade)clearInterval(AT.op_id);
AT.navtxt.style.display="none";
AT.navtxt.style.visibility="hidden";
}
movenavtxt(-AT.boxwidth-10,0);
writeindiv('');
}}}

function incropacity(){
if(AT.ieop<=100){
AT.ieop+=7;
if(AT.ie4||AT.ie5)AT.navtxt.style.filter="alpha(opacity="+AT.ieop+")";
if(AT.ns6)AT.navtxt.style.MozOpacity=AT.ieop/100;
}else clearInterval(AT.op_id);
}

function moveobj(evt){
mx=(AT.ie5||AT.ie4)?event.clientX:evt.pageX;
my=(AT.ie5||AT.ie4)?event.clientY:evt.pageY;
if(AT.isloaded && AT.ishover && AT.oktomove){
margin=(AT.ie4||AT.ie5)?5:25;
if(AT.ns6)if(document.height+27-window.innerHeight<0)margin=15;
if(AT.ns4)if(document.height-window.innerHeight<0)margin=10;
if(AT.ns4||AT.ns6)mx-=getpagescrollx();
if(AT.ns4)my-=getpagescrolly();
xoff=mx+xoffset;
yoff=(my+AT.boxheight+yoffset-((AT.ns6)?getpagescrolly():0)>=AT.w_y)? -5-AT.boxheight-yoffset: yoffset;
movenavtxt( Math.min(AT.w_x-AT.boxwidth-margin , Math.max(2,xoff))+getpagescrollx(), my+yoff+((!AT.ns6)?getpagescrolly():0));
if(!mousefollow)AT.oktomove=false;
}}

if(AT.ns4)document.captureEvents(Event.MOUSEMOVE);

document.onmousemove=moveobj;

window.onload=function(){
  AT.navtxt=(AT.ns4)? document.layers['navtxt'] : (AT.ie4)? document.all['navtxt'] : (AT.w3c)? document.getElementById('navtxt') : null;
  getboxwidth();
  getboxheight();
  getwindowdims();
  AT.isloaded=true;
  if((AT.w3c || AT.ie4) && centertext)AT.navtxt.style.textAlign="center";
  if(AT.w3c)AT.navtxt.style.padding='4px';
  if(AT.ie4 || AT.ie5 && dofade)AT.navtxt.style.filter="alpha(opacity=0)";
  }

window.onresize=getwindowdims;

function printVersie(nummer){
var popurl="boeken/printversie.php?nummer="+nummer;
winpops=window.open(popurl,"","width=445,height=485,scrollbars,")
}

function faq(){
var popurl="verkoop/faq.php";
winpops=window.open(popurl,"","width=455,height=500,scrollbars,")
}

function galgje(){
var popurl="galgje/galgje.php";
winpops=window.open(popurl,"","width=700,height=500,,")
}

function vergroting(taal, nummer){
var popurl="buitenlandse/vergroting.php?nummer="+nummer+"&taal="+taal;
winpops=window.open(popurl,"","width=324,height=500,")
}

function smilie(Smilie){
     document.form.bericht.value =
     document.form.bericht.value + Smilie;
     document.form.bericht.focus();
}

 function Controleer(obForm,szFields)
    {
      var fields = szFields.split(",")
      var szMissing= new Array();
      for (x=0;x<fields.length;x++) {
        if (obForm.elements[fields[x]].value.length==0) {
           szMissing[szMissing.length]=new String(fields[x]);
        }
      }
      if (szMissing.length) {
        alert("De volgende verplichte velden zijn niet ingevuld:"+((szMissing.length>1)?" ":" ")+szMissing.join(",")+". Vult u deze aub in en probeert u het nog eens.");
        return false
      }
      return true;
    }