// Rotating homepage image panel

if (document.getElementById) { window.onload = swap };
function swap() {
var numimages=4;
rndimg = new Array("http://www.cambridgeassessment.org.uk/ca/digitalAssets/194674_home01a.jpg", "http://www.cambridgeassessment.org.uk/ca/digitalAssets/194675_home02a.jpg", "http://www.cambridgeassessment.org.uk/ca/digitalAssets/194676_home03a.jpg", "http://www.cambridgeassessment.org.uk/ca/digitalAssets/194677_home04a.jpg"); 
x=(Math.floor(Math.random()*numimages));
randomimage=(rndimg[x]);
document.getElementById("paneltext").style.backgroundImage = "url("+ randomimage +")"; 
}