function IframeHeight(htmlpage,strTitle,selid){

  DeselectMenu1();
  DeselectMenu2();

  arrSelID = selid.split('sub')
  //htmlpage = name of html-page before .html
  //strTitle = Title of the subject
  //selid    = id of selected button

  strWindowMaxHeight = parent.window.document.body.clientHeight;

  if(brow=='Opera'){
      //_________________________________
      // ...% from users available height
      strIframeHeight = '640px';
      //______________
      //Set Div Height
      document.getElementById('myiframe').style.height = strIframeHeight;
      document.getElementById('myiframe').innerHTML= '<IFRAME id="mycontent" frameborder="0" style="height:' + strIframeHeight + '; width:500px;" scrolling="yes" src="../' + htmlpage + '.html" class="scrollbar"></IFRAME>'

  }else{
      //_________________________________
      // ...% from users available height
      strIframeHeight = Math.round(((strWindowMaxHeight)/100)*98)- 122+'px';
      //______________
      //Set Div Height
      document.getElementById('myiframe').style.height = strIframeHeight;
      document.getElementById('myiframe').innerHTML= '<IFRAME id="mycontent" frameborder="0" scrolling="yes" src="../' + htmlpage + '.html" width="500px" height="'+strIframeHeight+'" class="scrollbar"></IFRAME>'
  }

  //_________
  //Set Title
  document.getElementById('mytitle').innerHTML = strTitle;
  
  //_______________________
  // Set Button to Selected
  if(arrSelID[1] >= 5){
    // Change color of text button menu1
    eval(selid).style.color='#FFFFFF';
  }else{
     MM_nbGroup('down','group1','sub' + arrSelID[1] + '','img/btn_sub' + arrSelID[1] + '_r.jpg',1);
  }
}

function DeselectMenu1(){
  // Bij het wijzigen van het aantal menu items:
  // 1. pas eventueel de waarde van variable 'intFirstTxtBtnId' aan.
  // 2. pas eventueel de waarde van variable 'intLastTxtBtnId' aan.
  intFirstTxtBtnId =  9;
  intLastTxtBtnId  = 12 + 1;
  for(i=intFirstTxtBtnId; i<intLastTxtBtnId; i++){
	document.getElementById('sub' + i).style.color = '#FFC8C8';
  } 
  
}
function DeselectMenu2(){
  MM_nbGroup('down','group1','sub0','img/btn_sub1_r.jpg',1);
}

<!--
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
//-->

/**************************************************************
 *  Index       : 16.0                                        *
 *  Function    : MM_reloadPage(init)                         *
 *  Version     : 4.0                                         *
 *  Author(s)   : Macromedia                                  *
 **************************************************************/
function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

/**************************************************************
 *  Index       : 17.0                                        *
 *  Function    : MM_preloadImages()                          *
 *  Version     : 3.0                                         *
 *  Author(s)   : Macromedia                                  *
 **************************************************************/
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

/**************************************************************
 *  Index       : 18.0                                        *
 *  Function    : MM_swapImgRestore()                         *
 *  Version     : 3.0                                         *
 *  Author(s)   : Macromedia                                  *
 **************************************************************/
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

/**************************************************************
 *  Index       : 19.0                                        *
 *  Function    : MM_nbGroup(event, grpName)                  *
 *  Version     : 6.0                                         *
 *  Author(s)   : Macromedia                                  *
 **************************************************************/
function MM_nbGroup(event, grpName) { //v6.0
  var i,img,nbArr,args=MM_nbGroup.arguments;
  if (event == "init" && args.length > 2) {
    if ((img = MM_findObj(args[2])) != null && !img.MM_init) {
      img.MM_init = true; img.MM_up = args[3]; img.MM_dn = img.src;
      if ((nbArr = document[grpName]) == null) nbArr = document[grpName] = new Array();
      nbArr[nbArr.length] = img;
      for (i=4; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
        if (!img.MM_up) img.MM_up = img.src;
        img.src = img.MM_dn = args[i+1];
        nbArr[nbArr.length] = img;
    } }
  } else if (event == "over") {
    document.MM_nbOver = nbArr = new Array();
    for (i=1; i < args.length-1; i+=3) if ((img = MM_findObj(args[i])) != null) {
      if (!img.MM_up) img.MM_up = img.src;
      img.src = (img.MM_dn && args[i+2]) ? args[i+2] : ((args[i+1])? args[i+1] : img.MM_up);
      nbArr[nbArr.length] = img;
    }
  } else if (event == "out" ) {
    for (i=0; i < document.MM_nbOver.length; i++) {
      img = document.MM_nbOver[i]; img.src = (img.MM_dn) ? img.MM_dn : img.MM_up; }
  } else if (event == "down") {
    nbArr = document[grpName];
    if (nbArr)
      for (i=0; i < nbArr.length; i++) { img=nbArr[i]; img.src = img.MM_up; img.MM_dn = 0; }
    document[grpName] = nbArr = new Array();
    for (i=2; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) {
      if (!img.MM_up) img.MM_up = img.src;
      img.src = img.MM_dn = (args[i+1])? args[i+1] : img.MM_up;
      nbArr[nbArr.length] = img;
  } }
}


/**********************************************************************************
 *  Index       : 11.0                                                            *
 *  Function    : allowChars(myText, myChars)                                     *
 *  Version     : 1.5, 28/05/2003                                                 *
 *  Author(s)   : Jeroen Velders                                                  *
 *  Example     : onKeyUp="this.value = allowChars(this.value, 'a-zA-Z0-9-');"    *
 **********************************************************************************/
function allowChars(myText, myChars){
  var expPattern = new RegExp("[" + myChars + "]", "g");
  var strReturn = myText.match(expPattern,"");
  if (strReturn == null){
    return "";
  }else{
    return strReturn.join("");
  }
}


function CreateDate(){
 var mydate  = new Date();
 info.senddate.value = mydate.getVarDate();
}

<!--
function MM_validateForm() { //v4.0
  var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
  for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]);
    if (val) { nm=val.name; if ((val=val.value)!="") {
      if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
        if (p<1 || p==(val.length-1)) errors+='- Uw '+nm+' moet een geldig e-mail adres zijn.\n';
      } else if (test!='R') { num = parseFloat(val);
        if (isNaN(val)) errors+='- Uw'+nm+' kan alleen uit cijfers bestaan.\n';
        if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
          min=test.substring(8,p); max=test.substring(p+1);
          if (num<min || max<num) errors+='- Uw'+nm+' kan alleen een getal tussen de '+min+' en '+max+' zijn.\n';
    } } } else if (test.charAt(0) == 'R') errors += '- Uw '+nm+' moet u nog invullen.\n'; }
  } if (errors) alert('De volgende fouten zijn opgetreden:\n\n'+errors);
  document.MM_returnValue = (errors == '');
}
//-->

function showElements(theForm) {  
   str = "Form Elements of form " + theForm.name + ": \n "   
	for (i = 0; i < theForm.length; i++){
	  str += theForm.elements[i].name + "\n" ;
	  val = theForm.elements[i].value + "\n" ;
	  //alert(str +':'+ val);
	}
	info.submit();
	document.location='bedankt.html';
}