function blendoff(idname) {
		document.getElementById(idname).style.display = 'none';
		}
function blendon(idname) {
		document.getElementById(idname).style.display = 'block';
		}
function switch_C_class(wert) {
	if (wert=='1'){
		document.getElementById('menu_C_class1').className='ms-hover';
		document.getElementById('menu_C_class2').className='';
		blendon('first_C');
		blendoff('second_C'); 
	}else if (wert=='2'){
		document.getElementById('menu_C_class1').className='';
		document.getElementById('menu_C_class2').className='ms-hover';
		blendoff('first_C');
		blendon('second_C');
	}
}

function switch_E_class(wert) {
	if (wert=='1'){
		document.getElementById('menu_E_class1').className='ms-hover';
		document.getElementById('menu_E_class2').className='';
		document.getElementById('menu_E_class3').className='';
		blendon('first_E');
		blendoff('second_E'); 
		blendoff('third_E'); 
	}else if (wert=='2'){
		document.getElementById('menu_E_class1').className='';
		document.getElementById('menu_E_class2').className='ms-hover';
		document.getElementById('menu_E_class3').className='';
		blendoff('first_E');
		blendon('second_E');
		blendoff('third_E'); 
	}else if (wert=='3'){
		document.getElementById('menu_E_class1').className='';
		document.getElementById('menu_E_class2').className='';
		document.getElementById('menu_E_class3').className='ms-hover';
		blendoff('first_E');
		blendoff('second_E');
		blendon('third_E'); 
	}
}