function xs(el,n){document.getElementById(el).className = n;}
function tick(el){xs(el,'mtick_on')}
function ntick(el){xs(el,'mtick')}
function xi(isrc,ix,iy){
	var ii = document.getElementById('gimg');
	ii.innerHTML = '<img src="' + isrc + '" alt="" width="' + ix + '" height="' + iy + '" />';
}