var images=new Array();
images[0]="/wp-content/themes/McCann/images/sidepanel/McCann_Blog_Sidepanel1.jpg";
images[1]="/wp-content/themes/McCann/images/sidepanel/McCann_Blog_Sidepanel2.jpg";
images[2]="/wp-content/themes/McCann/images/sidepanel/McCann_Blog_Sidepanel3.jpg";
images[3]="/wp-content/themes/McCann/images/sidepanel/McCann_Blog_Sidepanel4.jpg";
images[4]="/wp-content/themes/McCann/images/sidepanel/McCann_Blog_Sidepanel5.jpg";
images[5]="/wp-content/themes/McCann/images/sidepanel/McCann_Blog_Sidepanel6.jpg";

var i=Math.floor(Math.random()*images.length); 

function randomImage() {

document.getElementById("random").src=images[i]; 
}

onload=randomImage;