var img=new Object();

if (document.images)
	{
    img["over"] = new Image();
    img["over"].src = "../img/enter_2.gif";
    img["out"] = new Image();
    img["out"].src  = "../img/enter_1.gif";
	img["click"] = new Image();
	img["click"].src  = "../img/enter_3.gif";
}

function mouse_o(action)
{
	var link=img[action].src;
	$("#btn_sub").attr("src", link);
	if(action=='click')
	{
		$("#form1").submit();
	}
}