$(document).ready(function(){
	var targetimg=$('.onoff img,#gnav img');
	for(var j=0;j<targetimg.length;j++){
		if($(targetimg[j]).parents('li').attr('class') != $('#page_name').attr('class')){
			$(targetimg[j]).mouseover(function(ev){
				img_on(ev);
			});
			$(targetimg[j]).mouseout(function(ev){
				img_off(ev);
			});
		}else{
			var src=$(targetimg[j]).attr('src');
			var newsrc=src.replace("_off","_on");
			$(targetimg[j]).attr('src',newsrc);
		}
	}
		
});

function img_on(ev){
	var src=$(ev.target).attr('src');
	var newsrc=src.replace("_off","_on");
	$(ev.target).attr('src',newsrc);

}

function img_off(ev){
	var src=$(ev.target).attr('src');
	var newsrc=src.replace("_on","_off");
	$(ev.target).attr('src',newsrc);
}