function SetCookie(name,value)
{
    var Days = 30; 
    var exp  = new Date();
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString()+';path=/';
}
function getCookie(name)
{
    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
     if(arr != null) return unescape(arr[2]); return null;

}
function delCookie(name)
{
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval=getCookie(name);
    if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString()+';path=/';
}
function getJSONCookie(name){
	if(!isNull(name)){
		var value = getCookie(name);
		if(!isNull(value)){
			return JSON.decode(value);
		}
	}
	return  null;
}
function setJSONCookie(name,value){
	SetCookie(name,JSON.encode(value));
}
function getJSONCookieValue(name,att){
	return getString(getJSONCookie(name),att);
}