nctday=new Date();
day=nctday.getDay();

var numberofimages = 7;
images = new Array(numberofimages+1);
images[0] = "<img src='/images/footer1.gif'>";
images[1] = "<img src='/images/footer2.gif'>";
images[2] = "<img src='/images/footer3.gif'>";
images[3] = "<img src='/images/footer4.gif'>";
images[4] = "<img src='/images/footer5.gif'>";
images[5] = "<img src='/images/footer6.gif'>";
images[6] = "<img src='/images/footer7.gif'>";

document.write(images[day]);