function showblock(blockid) {
  for(i=0;i<=6;i++) {
	if( document.getElementById('block_'+i) ) {
	  if( blockid == i ) {
		if( document.getElementById('block_'+i).style.display=='block' ) {
		  document.getElementById('block_'+i).style.display='none';	
		} 
		else {
		  document.getElementById('block_'+i).style.display='block';	
		}
	  } 
	  else {
		document.getElementById('block_'+i).style.display='none'; 		
	  }
	}
  }
}

/*
<input type="radio" onclick="showblock('1');" onkeypress="showblock('1');" name="name" value="1">per Nachnahme</td>
	<div style="display: none;" id="block_1">[options]</div>
*/

function hideblock(blockid) {
  for(i=0;i<=6;i++) {
	if( document.getElementById('block_'+i) ) {
		document.getElementById('block_'+i).style.display='none'; 		
	}
  }
}