เมื่อกดปุ่ม back แล้วอยากให้ form ที่โชว์ด้วย ajax ยังอยู่

<script language="JavaScript"> 
 
function setCookie(name, value,	expires, path, domain, secure) {
    document.cookie= name + "="	+ escape(value)	+
	((expires) ? ";	expires=" + expires.toGMTString() : "")	+
	((path)	? "; path=" + path : "") +
	((domain) ? "; domain="	+ domain : "") +
	((secure) ? "; secure" : "");
}
 
function getCookie(name) {
    var	dc = document.cookie;
    var	prefix = name +	"=";
    var	begin =	dc.indexOf("; "	+ prefix);
    if (begin == -1) {
	begin =	dc.indexOf(prefix);
	if (begin != 0)	return null;
    } else {
	begin += 2;
    }
    var	end = document.cookie.indexOf(";", begin);
    if (end == -1) {
	end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length,	end));
}
 
function deleteCookie(name, path, domain) {
    if (getCookie(name)) {
	document.cookie	= name + "=" +
	    ((path) ? "; path="	+ path : "") +
	    ((domain) ?	"; domain=" + domain : "") +
	    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
}
// กำหนด Cookie
setCookie("cookie_name","value");

// อ่าน Cookie
getCookie(cookie_name"");

// ลบ Cookie
deleteCookie("cookie_name");

 
</script>