function tabSwitch_2(active, number, tab_prefix, content_prefix) {

    for (var i=1; i < number+1; i++) {
      document.getElementById(content_prefix+i).style.display = 'none';
      document.getElementById(tab_prefix+i).className = '';
    }
    document.getElementById(content_prefix+active).style.display = 'block';
    document.getElementById(tab_prefix+active).className = 'active';    

}


<!-- START Menü -->

sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

<!-- ENDE Menü -->



<!-- START Ein/Ausblenden Carousel -->

function toggleDisplay() {
  document.getElementById("carousel").style.visibility = "visible";
  if(document.getElementById("carousel").style.display == "none" ) {
    document.getElementById("carousel").style.display = "";
  }
  else {
    document.getElementById("carousel").style.display = "none";
  }
}

function toggleSitemap() {
  document.getElementById("sitemap").style.visibility = "";
  if(document.getElementById("sitemap").style.display == "" ) {
    document.getElementById("sitemap").style.display = "none";
  }
  else {
    document.getElementById("sitemap").style.display = "";
  }
}
<!-- ENDE Ein/Ausblenden Carousel -->

// Set thickbox loading image
tb_pathToImage = "images/loading-thickbox.gif";

var bildervorschau_itemList = [
    {url: "http://30493.web.zcom.it/fileadmin/templates/img/header/aktuell.jpg", title: "Aktuelles"},
    {url: "http://30493.web.zcom.it/fileadmin/templates/img/header/superski.jpg", title: "Superski"},
    {url: "http://30493.web.zcom.it/fileadmin/templates/img/header/Familie.jpg", title: "Familie"},
    {url: "http://30493.web.zcom.it/fileadmin/templates/img/header/Home.jpg", title: "Hotel Valserhof"},
    {url: "http://30493.web.zcom.it/fileadmin/templates/img/header/Hotelbewertung.jpg", title: "Hotelbewertungen"},
    {url: "http://30493.web.zcom.it/fileadmin/templates/img/header/koerperbehandlung.jpg", title: "Körperbehandlungen"},
    {url: "http://30493.web.zcom.it/fileadmin/templates/img/header/skitouren.jpg", title: "Skitouren"}
];

function bildervorschau_itemLoadCallback(carousel, state)
{
    for (var i = carousel.first; i <= carousel.last; i++) {
        if (carousel.has(i)) {
            continue;
        }

        if (i > bildervorschau_itemList.length) {
            break;
        }

        // Create an object from HTML
        var item = jQuery(bildervorschau_getItemHTML(bildervorschau_itemList[i-1])).get(0);

        // Apply thickbox
        tb_init(item);

        carousel.add(i, item);
    }
};

/**
 * Item html creation helper.
 */
function bildervorschau_getItemHTML(item)
{
    var url_m = item.url.replace(/_s.jpg/g, '_m.jpg');
    return '<a href="' + url_m + '" title="' + item.title + '"><img src="' + item.url + '" width="145" height="90" border="0" alt="' + item.title + '" /></a>';
};

function mycarousel_initCallback(carousel)
{
    // Disable autoscrolling if the user clicks the prev or next button.
    carousel.buttonNext.bind('click', function() {
        carousel.startAuto(0);
    });

    carousel.buttonPrev.bind('click', function() {
        carousel.startAuto(0);
    });

    // Pause autoscrolling if the user moves with the cursor over the clip.
    carousel.clip.hover(function() {
        carousel.stopAuto();
    }, function() {
        carousel.startAuto();
    });
};


jQuery(document).ready(function() {
		jQuery('#mycarousel').show();
    jQuery('#mycarousel').jcarousel({
        vertical: true,
		auto: 3,
        wrap: 'last',
		animation: 'slow',
        scroll: 1
    });
		jQuery('#bildervorschau').jcarousel({
        size: bildervorschau_itemList.length,
        itemLoadCallback: {onBeforeAnimation: bildervorschau_itemLoadCallback},
		scroll: 1,
		wrap: 'last'
		
    });    
    $("#nav-sitemap > li").wrap('<div class="column"></div>');
    if(jQuery.browser.msie&&jQuery.browser.version<=7){$('iframe').attr('allowTransparency','true');}
    
    $('#QRvCardkl').hover(
    	function(){
    		$('#QRvCard').stop(true,true).fadeIn();
    	},function(){
    		$('#QRvCard').stop(true,true).fadeOut();	
    	}
    );
    $('#QRCallkl').hover(
    	function(){
    		$('#QRCall').stop(true,true).fadeIn();
    	},function(){
    		$('#QRCall').stop(true,true).fadeOut();	
    	}
    );
   if($('html').attr('xml:lang')=='de'){
   	$('#QRCallkl').next('p.qrDesc').text('anrufen');
   }else if($('html').attr('xml:lang')=='it'){
   	$('#QRCallkl').next('p.qrDesc').text('Per telefonare');
   }else if($('html').attr('xml:lang')=='en'){
   	$('#QRCallkl').next('p.qrDesc').text('To call');
   }else if($('html').attr('xml:lang')=='fr'){
   	$('#QRCallkl').next('p.qrDesc').text('Pour appeler');
   }
});

function sethover(bildid, bildurl) {
	document.getElementById(bildid).src = 'http://30493.web.zcom.it/fileadmin/templates/img/layout/sw/' + bildurl + '-hover.jpg'
}
function unhover(bildid, bildurl) {
	document.getElementById(bildid).src = 'http://30493.web.zcom.it/fileadmin/templates/img/layout/sw/' + bildurl + '.jpg'
}