function strrpos( haystack, needle, offset){	// Find position of last occurrence of a char in a string
	// 
	// + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
	var i = haystack.lastIndexOf( needle, offset ); // returns -1
	return i >= 0 ? i : false;
}

strrpos('Kevin van Zonneveld', 'e');