function imgover (id, direction) {

	/* Használata: <a href="[url]" onmouseover="imgover('[id]','on')" onmouseout="imgover('[id]','off')"><img src="[url - off]" id="[id]" /></a> */

	var src = document.getElementById(id).src
	if (direction == "on") {
		var rawsrc = src.substr(0, src.length-8);
		document.getElementById(id).src = rawsrc + "_on.png";
	} else {
		var rawsrc = src.substr(0, src.length-7);
		document.getElementById(id).src = rawsrc + "_off.png";
	}
}