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function slug (string) {
	var	str = string.replace(/^\s+|\s+$/g, ""); // trim
	str = str.toLowerCase();

	// remove accents, swap ñ for n, etc
	var from = "ãàáäâèéëêìíïîòóöôõùúüûñç·/_,:;";
	var to   = "aaaaaeeeeiiiiooooouuuunc------";
	for (var i=0, l=from.length ; i<l ; i++) {
		str = str.replace(new RegExp(from.charAt(i), "g"), to.charAt(i));
	}

	str = str.replace(/[^a-z0-9 -]/g, "") // remove invalid chars
		.replace(/\s+/g, "-") // collapse whitespace and replace by -
		.replace(/-+/g, "-"); // collapse dashes

	return str;
}