function randomizeContent(classname){
		if(typeof document.cloneNode!=='undefined'){
		var contents=randomizeContent.collectElementbyClass(classname);
		contents.ref.sort(function() {return 0.5 - Math.random();});0
		if(contents.ref.length>4)
		{
			var indexcont = 4;
		}
		else
		{
			var indexcont = contents.ref.length;
		}
		for (var i=0; i<indexcont; i++){
		contents.par[i].replaceChild(contents.ref[i],contents.theNodes[i]);
		contents.ref[i].style.display="block";
		}
		}
		}
		
		randomizeContent.collectElementbyClass=function(classname){ //return three arrays containing elements with specified classname, plus a clone of themselves, plus a list of their parentNodes
		var classnameRE=new RegExp("(^|\\s+)"+classname+"($|\\s+)", "i"); //regular expression to screen for classname within element
		var contentobj=new Object();
		contentobj.ref=new Array(); //array containing clones of the participating nodes
		contentobj.par=new Array(); //array containing participating contents' parentNodes
		contentobj.theNodes=[]; //array containing the participating nodes
		var alltags=document.all? document.all : document.getElementsByTagName("*");
		for (var i_tem = 0; i_tem < alltags.length; i_tem++)
		if (typeof alltags[i_tem].className=="string" && alltags[i_tem].className.search(classnameRE)!=-1)
		contentobj.theNodes[contentobj.theNodes.length]=alltags[i_tem];
		for (var i=0; i<contentobj.theNodes.length; i++){
		contentobj.par[contentobj.par.length]=contentobj.theNodes[i].parentNode;
		contentobj.ref[contentobj.ref.length]=contentobj.theNodes[i].cloneNode(true);
		}
		return contentobj
		}