var buttonids=new Array();
	buttonids[0]="button01";
	buttonids[1]="button02";
	buttonids[2]="button03";
	buttonids[3]="button04";
	buttonids[4]="button05";
	buttonids[5]="button06";
	var buttonimgs=new Array();
	var buttonimgs_on=new Array();
	buttonimgs[0]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_01.gif";
	buttonimgs[1]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_02.gif";
	buttonimgs[2]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_03.gif";
	buttonimgs[3]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_04.gif";
	buttonimgs[4]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_05.gif";
	buttonimgs[5]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_06.gif";
	buttonimgs_on[0]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_01_on.gif";
	buttonimgs_on[1]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_02_on.gif";
	buttonimgs_on[2]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_03_on.gif";
	buttonimgs_on[3]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_04_on.gif";
	buttonimgs_on[4]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_05_on.gif";
	buttonimgs_on[5]="http://www-2.virtualevents365.com/tdstimulus/images/btn_main_nav_06_on.gif";
	function setAllClear(){
		setHighlighted(-1);
	}
	function setHighlighted(idx){
		for(var i=0;i<buttonids.length;i++){
			var btnimg=document.getElementById(buttonids[i]);
			if(btnimg&&btnimg.nodeType&&btnimg.nodeType==1&&btnimg.tagName.toLowerCase()=="img"){
				if(i==idx){
					btnimg.src=buttonimgs_on[i];
				}else{
					btnimg.src=buttonimgs[i];
				}
			}
		}
	}