function strrpos (haystack, needle, offset) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   bugfixed by: Onno Marsman
    // +   input by: saulius
    // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
    var i = -1;
    if (offset) {
        i = (haystack+'').slice(offset).lastIndexOf(needle);
        if (i !== -1) {
            i += offset;
        }
    }
    else {
        i = (haystack+'').lastIndexOf(needle);
    }
    return i >= 0 ? i : false;
}

function strpos (haystack, needle, offset) {
    // Finds position of first occurrence of a string within another  
    // 
    // version: 1008.1718
    // discuss at: http://phpjs.org/functions/strpos    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Onno Marsman    
    // +   bugfixed by: Daniel Esteban
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: strpos('Kevin van Zonneveld', 'e', 5);    // *     returns 1: 14
    var i = (haystack+'').indexOf(needle, (offset || 0));
    return i === -1 ? false : i;
}