Split

javascript:
function split(str, d)
{
    var Next = function(str, offset, length)
    {
        var out = "";
        for(var I = offset, L = offset + length; I < L; I++)
            out += str[I];

        return out;
    };

    var out = [];

    var buffer = "";
    for(var I = 0; I < str.length; I++)
    {
        if(Next(str, I, d.length) != d)
            buffer += str[I];
        else
        {
            out.push(buffer);
            buffer = "";
            I += d.length - 1;
        }
    }

    buffer.length > 0 && out.push(buffer);
    return out;
}

alert(split("123lol456lol789lol :D", "lol"));
void null;