function togglePhoto(src) {
	var mainphoto_src = document.getElementById('mainphoto').src;
	document.getElementById('mainphoto').src = document.getElementById(src).src;
	document.getElementById(src).src = mainphoto_src;
}
Event.observe(window, 'load', function() {

    $$('a[href!=""]').each(function(link){
        var siteregex = /^(http:\/\/)([a-z]*\.)?(autoverhuur-direct.nl)/i;
        if(link.readAttribute('href').startsWith('http://') &&
          !link.readAttribute('href').match(siteregex)){
            link.writeAttribute('target','_blank');
            link.writeAttribute('rel','external');
        }
    });

    $$('a[rel="external"]').each(function(link){
        if(link.readAttribute('href') != '' && link.readAttribute('href') != '#'){
            link.writeAttribute('target','_blank');
        }
    });
});