function dec2anybase(num , base){
	var arr = [] , rem =0 , count = "";
  var n = num , b = base;

  while( n > 0){
  	rem = Math.floor(n % b);
    arr.push(rem);
    n = Math.floor(n /b);
  }
	//alert(arr);
  while(arr.length !==0){
  	count += arr.pop();
  }
  return count;
}
alert(dec2anybase(10 , 2));