function onSearchMouseOver(e){
	var target_dom = Event.element(e);
	target_dom.src = target_dom.on.src;
}

function onSearchMouseOut(e){
	var target_dom = Event.element(e);
	target_dom.src = target_dom.off.src;
}

function initSearchButton(){

	var dom_list = $$("#searchnavi a img");
	
	for(var i=0; i<dom_list.length; i++){
		
		dom_list[i].on = new Image();
		dom_list[i].on.src = dom_list[i].src.replace("-off", "-on");
		dom_list[i].off = new Image();
		dom_list[i].off.src = dom_list[i].src.replace("-on", "-off");
		
		Event.observe(dom_list[i], 'mouseover', onSearchMouseOver);
		Event.observe(dom_list[i], 'mouseout', onSearchMouseOut);
	}
}
Event.observe(window, "load", initSearchButton);