Javascript: Calculate Resize Dimensions

gistfile1

function calculateResize (_params) {
	var ratio	= 0;
	var output	= {
		width	: _params.current_width,
		height	: _params.current_height
	};

	if(_params.current_width > _params.max_width){
		ratio					= _params.max_width / _params.current_width;
		output.width			= parseInt(_params.max_width, 10);
		output.height			= parseInt((_params.current_height * ratio), 10);
		_params.current_height	= _params.current_height * ratio;
		_params.current_width	= _params.current_width * ratio;
	}

	if(_params.current_height > _params.max_height){
		ratio					= _params.max_height / _params.current_height;
		output.height			= parseInt(_params.max_height, 10);
		output.width			= parseInt((_params.current_width * ratio), 10);
		_params.current_width	= _params.current_width * ratio;
	}

	return output;
}

var newSize = calculateResize({
	current_width	: 300,
	current_height	: 100,
	max_width		: 280,
	max_height		: 195
});

console.log(newSize);