// JavaScript Document
function setRandomClass(id, prefix, suffix, attrName, n){
	var rnd = Math.floor(Math.random()*( n + 1));
	var el = document.getElementById(id);
	if (el) {
	   var s = 'el.'+attrName + ' = "'+prefix + rnd + suffix+'";';
	   eval(s);
	}
}