JS version for funsies. I didn't like the idea of specifically checking for simultaneous mod3 and mod5, so I made this.

  for (i=1; i<101; i++) {
  	var result = "";
  	if(i%3 == 0)
  		result += "Fizz";
  	if(i%5 == 0) 
  		result += "Buzz";
  	if(result.length == 0)
  		result = i;
  	document.write(result+"<br>");
  }