flash sound spectrum analyser

I need a sound spectrum analyser which will be placed in a website. It show the spectrum to user in real time and measure it by displaying a real time result telling how high/low the sound level is. The intended use of this analyser is to tell people if their environmental sound is healthy or polluted. There are many spectrum analyser source code on the web. I'm simply looking for a cheap solution which you will use ready code and customise the look and feel according to our design and show the levels to the user. The max budget is $150. Deadline is 3 days. Winning freelancer should be able to start in a weeks time.