var last_id = null;

function show_block(id_block){
	if(last_id != null && last_id != id_block){
		close_block(last_id);
	}
	last_id=id_block;
	open_block(id_block);
}
function open_block(id_block){
	elem = document.getElementById(id_block);
	if(elem.style.display == 'none' || elem.style.display == ''){
		elem.style.display = 'block';
	}else{
		close_block(id_block);
	}
}
function close_block(id_block){
	elem = document.getElementById(id_block);
	elem.style.display = 'none';
}
function print_mail(pre, suf){
	var mail="<a href=mailto:";	 
	mail += pre;
	mail +="@";
	mail += suf;
	mail += ">";
	mail += pre;
	mail +="@";
	mail += suf;
	mail +="</a>"; 
	document.write(mail);
}
function print_mail_style(pre, suf, style){
	var mail="<a class=\"" + style + "\" href=\"mailto:";	 
	mail += pre;
	mail +="@";
	mail += suf;
	mail += "\">";
	mail += pre;
	mail +="@";
	mail += suf;
	mail +="</a>"; 
	document.write(mail);
}