function SwitchContent(src, target)
{
 var obj = document.getElementById(target); 
 var obj2 = document.getElementById(src);
 if (obj2) obj.innerHTML = obj2.innerHTML;
}

function SwitchEnvelopes(ind, lang)
{
 if (lang=='de') {
	 for (i=0; i<6; i++) {
	   var obj = document.getElementById('txt_ext_'+i); 
	   if (obj) obj.style.display = 'none';
	 }
	 obj = document.getElementById('txt_ext_'+ind);
	 obj.style.display = 'block'; 
 } else {
	 var istart = ((ind==2) || (ind==3))? 1 : 2;
	 for (i=istart; i<4; i++) {
	   var obj = document.getElementById('txt_ext_'+i); 
	   if (obj) obj.style.display = 'none';
	 }
	 for (i=4; i<8; i++) {
	   var obj = document.getElementById('txt_ext_'+i); 
	   if (obj) obj.style.display = 'none';
	 }
	 obj = document.getElementById('txt_ext_'+ind);
	 obj.style.display = 'block';
 }
 obj = document.getElementById('div_current');
 document.getElementById('side_text').innerHTML = obj.innerHTML.replace(/txt_ext_/g, 'txtxextx');

}

function SwitchCouvertic(ind, lang)
{
 if (lang=='pl') {
	 for (i=1; i<6; i++) {
	   var obj = document.getElementById('txt_ext_'+i); 
	   if (obj) obj.style.display = 'none';
	 }
	 obj = document.getElementById('txt_ext_'+ind);
	 obj.style.display = 'block'; 
 }
 obj = document.getElementById('div_current');
 document.getElementById('side_text').innerHTML = obj.innerHTML.replace(/txt_ext_/g, 'txtxextx');

}