function deleteItem(key) {
    	var data = cleanDirty((WIN[STORE].getItem(STORENAME) || "").split("; ")),
    	    pos  = posItem(data, key);

    	if(pos > -1) {
    		data.splice(pos, 1);
    	}

    	data = data.join("; ");
    	data && WIN[STORE].setItem(STORENAME, data);
    }
delete the store data in localStorage with the key
@param  {String}   key The key of the store
@return {null}     null