Javascript Hash OnChange Event

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A pretty nifty solution to bind an event (err) to the window.location.hash string.

var onHashChange = function(event) {
	//get hash function
	var getHashValue = function() {
		var arr = window.location.hash.split("#");
		var hasValue = arr[1];
		//sets default
		if (typeof hasValue == "undefined") {
			return false;
		}

		var hashLen = hasValue.indexOf("?");
		if(hashLen>0){
			hasValue = hasValue.substring(0,hashLen);
		}
		return hasValue;
	}

	//last hash
	var lastHash = getHashValue();

	//checker
	(function watchHash() {
		var hash = getHashValue();

		if (hash !== lastHash) {
			event();
			lastHash = hash;
		}
		
		var t = setTimeout(watchHash, 100);

	})();
} 

onHashChange(function() {
	// your code here
};

AND YES, this is supportet in all the latest browsers!