//ロールオーバー*********************************************

//.jpg
function rollOver_jpg(_obj){
	var newFile = _obj.src.substring(0,_obj.src.length-7);
	newFile = newFile+"_ov.jpg";
	_obj.src = newFile;
}

function rollOut_jpg(_obj){
	var newFile = _obj.src.substring(0,_obj.src.length-7);
	newFile = newFile+"_of.jpg";
	_obj.src = newFile;
}

//.gif
function rollOver_gif(_obj){
	var newFile = _obj.src.substring(0,_obj.src.length-7);
	newFile = newFile+"_ov.gif";
	_obj.src = newFile;
}

function rollOut_gif(_obj){
	var newFile = _obj.src.substring(0,_obj.src.length-7);
	newFile = newFile+"_of.gif";
	_obj.src = newFile;
}