JavaScript Timer

// A simple JS timer to change Mels background image every hour.
// Credit: x0Z3ro0x DO NOT REDISTRIBUTE WITHOUT MY PERMISSION!!

var imageTimer = new Date().getHours();

if (imageTimer == 0)     // 12:00 AM (Midnight)
{
    document.body.background = "images/pic1.jpg";
}
else if (imageTimer == 1)     // 1:00 AM
{
    document.body.background = "images/pic2.jpg";
}
else if (imageTimer == 2)     // 2:00 AM
{
    document.body.background = "images/pic3.jpg";
}
else if (imageTimer == 3)     // 3:00 AM
{
    document.body.background = "images/pic4.jpg";
}
else if (imageTimer == 4)     // 4:00 AM
{
    document.body.background = "images/pic5.jpg";
}
else if (imageTimer == 5)     // 5:00 AM
{
    document.body.background = "images/pic6.jpg";
}
else if (imageTimer == 6)     // 6:00 AM
{
    document.body.background = "images/pic7.jpg";
}
else if (imageTimer == 7)     // 7:00 AM
{
    document.body.background = "images/pic8.jpg";
}
else if (imageTimer == 8)     // 8:00 AM
{
    document.body.background = "images/pic9.jpg";
}
else if (imageTimer ==9)     // 9:00 AM
{
    document.body.background = "images/pic10.jpg";
}
else if (imageTimer == 10)     // 10:00 AM
{
    document.body.background = "images/pic11.jpg";
}
else if (imageTimer == 11)     // 11:00 AM
{
    document.body.background = "images/pic12.jpg";
}
else if (imageTimer == 12)     // 12:00 PM (Noon)
{
    document.body.background = "images/pic13.jpg";
}
else if (imageTimer == 13)     // 1:00 PM
{
    document.body.background = "images/pic14.jpg";
}
else if (imageTimer == 14)     // 2:00 PM
{
    document.body.background = "images/pic15.jpg";
}
else if (imageTimer == 15)     // 3:00 PM
{
    document.body.background = "images/pic16.jpg";
}
else if (imageTimer == 16)     // 4:00 PM
{
    document.body.background = "images/pic17.jpg";
}
else if (imageTimer == 17)     // 5:00 PM
{
    document.body.background = "images/pic18.jpg";
}
else if (imageTimer == 18)     // 6:00 PM
{
    document.body.background = "images/pic19.jpg";
}
else if (imageTimer == 19)     // 7:00 PM
{
    document.body.background = "images/pic20.jpg";
}
else if (imageTimer == 20)     // 8:00 PM
{
    document.body.background = "images/pic21.jpg";
}
else if (imageTimer == 21)     // 9:00 PM
{
    document.body.background = "images/pic22.jpg";
}
else if (imageTimer == 22)     // 10:00 PM
{
    document.body.background = "images/pic23.jpg";
}
else if (imageTimer == 23)     // 11:00 PM
{
    document.body.background = "images/pic24.jpg";
}
else     // In case something goes wrong, this image will be displayed. (Saves the trouble of waiting 24 hours to see if images work.)
{
    document.body.background = "images/error.jpg";
}