var DHTML = (document.getElementById || document.all); //geen Netscape 4
var screensize = 0; //geeft drie schermformaten weer: 800, 1024 en 1280
var vultekst=""; //tekst die in het te vullen gedeelte moet
var complete_wissel_image_string ="";
var tmpstr;

//functions

function zet_param( loc, param, def )
{
  var locationstring = "a"+loc;
  var pos, str, param_pos;
  var val = def;
  param += "=";

  pos = locationstring.indexOf('?');
  if ( pos != -1 )
  {
    str = locationstring.substr(pos);
    param_pos  = str.indexOf( param );

    if ( param_pos != -1 )
    {
      val = str.substring(param_pos+param.length)
      pos = val.indexOf(',');
      if ( pos != -1 )
      {
        val = val.substring(0, pos);
      }
    }
  }

  return( val );
}

function menu(taal)
{
  var str =
    '<div class="div_menu" style="top:  0%; left: -1.6%;"><a href=index.htm?id=home,taal=' + taal + '><img id="button_home" class="button" src=images/button/' + taal + '/home_uit.gif height=5%></a></div>' +
    '<div class="div_menu" style="top:  5%; left: -0.8%;"><a href=straatshow.htm?taal=' + taal + '><img id="button_straatshow" class="button" src=images/button/' + taal + '/straatshow_uit.gif height=5%></a></div>' +
    '<div class="div_menu" style="top: 10%; left:    0%;"><a href=bmx-act.htm?taal=' + taal + '><img id="button_bmx" class="button" src=images/button/' + taal + '/bmx_uit.gif height=5%></a></div>' +
    '<div class="div_menu" style="top: 15%; left:  0.8%;"><a href=eenwiel-act.htm?taal=' + taal + '><img id="button_eenwiel" class="button" src=images/button/' + taal + '/eenwiel_uit.gif height=5%></a></div>' +
    '<div class="div_menu" style="top: 20%; left:  1.6%;"><a href=holland.htm?taal=' + taal + '><img id="button_holland" class="button" src=images/button/' + taal + '/holland_uit.gif height=5%></a></div>' +
    '<div class="div_menu" style="top: 25%; left:  1.6%;"><a href=specials.htm?taal=' + taal + '><img id="button_specials" class="button" src=images/button/' + taal + '/specials_uit.gif height=5%></a></div>' +
    '<div class="div_menu" style="top: 30%; left:  2.4%;"><a href=index.htm?id=overons,taal=' + taal + '><img id="button_overons" class="button" src=images/button/' + taal + '/overons_uit.gif height=5%></a></div>' +
    '<div class="div_menu" style="top: 35%; left:  3.2%;"><a href=index.htm?id=contact,taal=' + taal + '><img id="button_contact" class="button" src=images/button/' + taal + '/contact_uit.gif height=5%></a></div>' +
    '';

  return( str );
}

function show(name)
{
	if (!DHTML) return;
	{
		var x = getObj(name);
		x.visibility = 'visible';
	}
}

function hide(name)
{
	if (!DHTML) return;
	{
		var x = getObj(name);
		x.visibility = 'hidden';
	}
}

function getObj(name)
{
  if (document.getElementById)
  {
    return document.getElementById(name).style;
  }
  else if (document.all)
  {
    return document.all[name].style;
  }
  else return false;
}

var winWidth = 0, winHeight = 0;
function windowSize()
{
  //alert( navigator.appName );
  //alert( parseInt(navigator.appVersion) );
  //alert( navigator.userAgent );

  if( document.body && ( document.body.clientWidth || document.body.clientHeight ) )
  {
    //IE 4 compatible
    //alert( "IE 4");
    winWidth = document.body.clientWidth;
    winHeight = document.body.clientHeight;
  }
  else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) )
  {
    //IE 6+ in 'standards compliant mode'
    //alert( "IE 6+");
    winWidth = document.documentElement.clientWidth;
    winHeight = document.documentElement.clientHeight;
  }
  else if( typeof( window.innerWidth ) == 'number' )
  {
    //Non-IE
    //alert( "Non-IE");
    winWidth = window.innerWidth;
    winHeight = window.innerHeight;
  }
  //  window.alert( 'Width = ' + winWidth );
  //  window.alert( 'Height = ' + winHeight );
}

var bgWidth = 1366;
var bgHeight = 768;
var halfWidth;
var halfHeight;

function setSize()
{
  var factor = winHeight / bgHeight;
  if ( bgWidth * factor < winWidth )
  {
    bgHeight = winHeight;
    bgWidth = bgWidth * factor;
  }
  else
  {
    factor = winWidth / bgWidth;
    bgHeight = bgHeight * factor;
    bgWidth = winWidth;
  }

  halfWidth = bgWidth / 2;
  halfHeight = bgHeight / 2;
}

function plaats_image(image,locatie)
{
  maak_image_string(image);
  document.getElementById(locatie).innerHTML = complete_wissel_image_string;
}

function maak_image_string(image)
{
  te_plaatsen_image = image;
  complete_wissel_image_string=String.fromCharCode(60)+'img src="'+te_plaatsen_image+'" />';
}

function plaats_tekst(tekstid,vulid)
{
  vultekst = document.getElementById(tekstid).innerHTML;
  document.getElementById(vulid).innerHTML = vultekst;
}

function opstart()
{
   document.bgColor='rgb(188,206,216)';	
}