function stripos ( f_haystack, f_needle, f_offset ){	// Find position of first occurrence of a case-insensitive string
	// 
	// +	 original by: Martijn Wieringa

	var haystack = f_haystack.toLowerCase();
	var needle = f_needle.toLowerCase();
	var index = 0;

	if(f_offset == undefined) {
		f_offset = 0;
	}

	if((index = haystack.indexOf(needle, f_offset)) > -1) {
		return index;
	}

	return false;
}