function size() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
  }
  //window.alert( 'Width = ' + myWidth );
  if(myWidth < 850) {
    document.getElementById('sitemap').style.display = 'none';
    document.getElementById('mainBak').style.width = '775px';
    document.getElementById('mainBak').style.marginLeft = '-386px';
    document.getElementById('bak_content').style.width = '758px';
  }
}

function checkEnter(oEvent){ //e is event object passed from function invocation
  if (oEvent.keyCode)
    iAscii = oEvent.keyCode;
  else if (oEvent.which)
    iAscii = oEvent.which;
  else
    return false;
  if (iAscii == 13) {
    window.location='?p=zoekresultaat&zoekwoord='+document.getElementById('zoekwoord').value;
  }
}