javascript round number to nearest 5

1Math.round(X);           // round X to an integer
2Math.round(10*X)/10;     // round X to tenths
3Math.round(100*X)/100;   // round X to hundredths
4Math.round(1000*X)/1000; // round X to thousandths

1function round5(x)
2{
3    return Math.ceil(x/5)*5;
4}
5