function clearAll(){
	var nav = document.getElementById("nav");
	var divs = nav.getElementsByTagName("li");
	for (var i=0; i<divs.length; i++) {
		divs[i].className = "";  //set div backgroundcolor as white
		//processSpan(divs[i],"#fff");		//set span backgroundcolor under existent div as white
		//processB(divs[i],"rtopwhite");		//set b backgroundcolor under existent div as white
	}
}

function processSpan(divobj,color){
	var spans = divobj.getElementsByTagName("span");
	for (var i=0; i<spans.length; i++) {
		spans[i].style.background = color;
	}
}

function processB(divobj,className){
	var bs = divobj.getElementsByTagName("b");
	for (var i=0; i<bs.length; i++) {
	//	alert(bs[i].getAttribute("class"));
		if(bs[i].className.indexOf("rtop")>=0){
			bs[i].className = className;
		}
	}
}

function setDivToBlue(num){
	clearAll();
	var nav = document.getElementById("nav");
	var divs = nav.getElementsByTagName("li");
	divs[num-1].className = "current";
	//processSpan(divs[num-1],"#0066FF");
	//processB(divs[num-1],"rtop");

}