function off(element){
	e=document.getElementById(element);
	e.style.display='none';
}
function on(element){
	e=document.getElementById(element);
	e.style.display='inline';
}
function toggle_el(element){
	e=document.getElementById(element);
	e.style.display=(e.style.display=='none'||e.style.display=='')?'inline':'none';
}