function wechs(x){
	if(x=='content'){
	document.getElementById("content_en").style.display = "none";
	document.getElementById("content").style.display = "block";
	}
	if(x=='content_en'){
	document.getElementById("content_en").style.display = "block";
	document.getElementById("content").style.display = "none";
	}
	if(x=='mittelspalte'){
	document.getElementById("mittelspalte_en").style.display = "none";
	document.getElementById("mittelspalte").style.display = "block";
	}
	if(x=='mittelspalte_en'){
	document.getElementById("mittelspalte_en").style.display = "block";
	document.getElementById("mittelspalte").style.display = "none";
	}


}