stock str_replace(_string[], _substr[])
{
    new _len = strlen(_substr), _len2 = strlen(_string); //len2 is needed as strins uses sizeof which won't work for the string.
    for(new x = strfind(_string, _substr); x!= -1; x = strfind(_string, _substr))
    {
        strdel(_string, x, x+_len);
        strins(_string, _substr, x);
    }
    return 1;
}