//this function, when attached to the master page, will automatically look for the body tag
//and append a css class called "background<randomNumber>".  This random number is determined
//in the first line of this function.  If this is changed MAKE SURE there is a class to suit it
//or you'll end up with no background.

var randomite = Math.floor(Math.random()*5) + 1;
var oppiBody = document.getElementsByTagName("body")[0];
oppiBody.className = ("background" + randomite);