Translate this javascript to jquery- 1

Translate this javascript to jquery- 1

How would you write this in jQuery?:
...
window.onload = init;

function init(){
    document.getElementById("div").onclick = setBackgroundColor;
}

function setBackgroundColor(){
    document.getElementById("div").style.backgroundColor = getRandomColor();
}

function getRandomColor(){
    var randomNumber = Math.floor(1+Math.random()*2);   
    switch(randomNumber){
        case 1:
            return "blue";
        break;
        case 2:
            return "red";
        break;
    }   
}
...