Transliteration in javascript

gistfile1.txt

 var normalize = (function() {
	var from = "ÃÀÁÄÂÈÉËÊÌÍÏÎÒÓÖÔÙÚÜÛãàáäâèéëêìíïîòóöôùúüûÑñÇç",
	to   = "AAAAAEEEEIIIIOOOOUUUUaaaaaeeeeiiiioooouuuunncc",
	mapping = {};
	for(var i = 0, j = from.length; i < j; i++ )
	mapping[ from.charAt( i ) ] = to.charAt( i );
	return function( str ) {
		var ret = [];
		for( var i = 0, j = str.length; i < j; i++ ) {
			var c = str.charAt( i );
			if( mapping.hasOwnProperty( str.charAt( i ) ) )
				ret.push( mapping[ c ] );
			else
				ret.push( c );
		}
		return ret.join( '' );
	}
})();