1function dec2Bin(dec)
2{
3    if(dec >= 0) {
4        return dec.toString(2);
5    }
6    else {
7        /* Here you could represent the number in 2s compliment but this is not what 
8           JS uses as its not sure how many bits are in your number range. There are 
9           some suggestions https://stackoverflow.com/questions/10936600/javascript-decimal-to-binary-64-bit 
10        */
11        return (~dec).toString(2);
12    }
13}
14