var storage = window.localStorage; 


function SaveData(key,data){
	storage.setItem(key,data);		
}
function IsNull(key){
	if(storage.getItem(key)==null){
		return false;
	}else{
		return true;
	}	
}
function ReadData(key){
	return storage.getItem(key);
}
function RemoveItemByKey(key){
	if(storage.getItem(key)!=null){
		storage.removeItem(key);
	}	
}
function ClearStorage(){
	storage.clear();
}