function _deleteFile(htOptions){
        $yobi.sendForm({
            "sURL"     : htOptions.sURL,
            "fOnLoad"  : htOptions.fOnLoad,
            "fOnError" : htOptions.fOnError,
            "htData"   : {"_method":"delete"},
            "htOptForm": {
                "method" :"post",
                "enctype":"multipart/form-data"
            }
        });
    }
delete specified file

@param {Hash Table} htOptions
@param {String} htOptions.sURL
@param {Function} htOptions.fOnLoad
@param {Function} htOptions.fOnError