function addEvent( obj, type, fn ) {
  if ( obj.attachEvent ) {
    obj['e'+type+fn] = fn;
    obj[type+fn] = function(){obj['e'+type+fn]( window.event );}
    obj.attachEvent( 'on'+type, obj[type+fn] );
  } else
    obj.addEventListener( type, fn, false );
}
function removeEvent( obj, type, fn ) {
  if ( obj.detachEvent ) {
    obj.detachEvent( 'on'+type, obj[type+fn] );
    obj[type+fn] = null;
  } else
    obj.removeEventListener( type, fn, false );
}



function addGoogleMaps() {
window.location.href='http://www.archezuerich.ch/cms/front_content.php?idcat=132&idart=69&lang=1';
}

function addHand()  {
document.getElementById('themaB').style.cursor="pointer";
}

function init()
{
  var btn = document.getElementById("themaB");
  btn.attachEvent("onclick", addHand());
}

window.onload = init;

window.onload = addEvent( document.getElementById('themaB'), 'click', function(){ addGoogleMaps(); });
window.onload = addEvent( document.getElementById('themaB'), 'mouseover', function(){ addHand(); });