(function($) {

  $.fn.tagcloud = function(options) {
	var opts = $.extend({}, $.fn.tagcloud.defaults, options);
	tagWeights = this.map(function(){
	  return $(this).attr("rel");
	})
	tagWeights = jQuery.makeArray(tagWeights).sort(compareWeights);
	lowest = tagWeights[0];
	highest = tagWeights.pop();
	range = highest - lowest;
	if(range == 0) {range = 1};
	// Sizes
	if (opts.size) {
	  fontIncr = (opts.size.end - opts.size.start)/range;
	}
	// Colors
	if (opts.color) {
	  colorIncr = colorIncrement (opts.color, range);
	}
	return this.each(function() {
	  weighting = $(this).attr("rel") - lowest;
	  if (opts.size) {
		$(this).css({"font-size": opts.size.start + (weighting * fontIncr) + opts.size.unit});        
	  }
	  if (opts.color) {
		$(this).css({"color": tagColor(opts.color, colorIncr, weighting)});
	  }
	})
  }

  $.fn.tagcloud.defaults = {
	size: {start: 14, end: 18, unit: "pt"}
  };

  // Converts hex to an RGB array
  function toRGB (code) {
	if (code.length == 4) {
	  code = jQuery.map(/\w+/.exec(code), function(el) {return el + el }).join("");
	}
	hex = /(\w{2})(\w{2})(\w{2})/.exec(code);
	return [parseInt("0x" + hex[1]), parseInt("0x" + hex[2]), parseInt("0x" + hex[3])];
  }

  // Converts an RGB array to hex
  function toHex (ary) {
	return "#" + jQuery.map(ary, function(i) {
	  hex =  i.toString(16);
	  hex = (hex.length == 1) ? "0" + hex : hex;
	  return hex;
	}).join("");
  }

  function colorIncrement (color, range) {
	return jQuery.map(toRGB(color.end), function(n, i) {
	  return (n - toRGB(color.start)[i])/range;
	});
  }

  function tagColor (color, increment, weighting) {
	rgb = jQuery.map(toRGB(color.start), function(n, i) {
	  ref = Math.round(n + (increment[i] * weighting));
	  if (ref > 255) {
		ref = 255;
	  } else {
		if (ref < 0) {
		  ref = 0;
		}
	  }
	  return ref;
	});
	return toHex(rgb);
  }

  function compareWeights(a, b)
  {
	return a - b;
  }


})(jQuery);