function strripos( haystack, needle, offset){	// Find position of last occurrence of a case-insensitive string in a string
	// 
	// +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

	var i = haystack.toLowerCase().lastIndexOf( needle.toLowerCase(), offset ); // returns -1
	return i >= 0 ? i : false;
}