if(document.images) {
	img120on = new Image();              //create mouseover image objects
        img120on.src = "images/track1_nav_on.gif";             
	img121on = new Image();
        img121on.src = "images/track2_nav_on.gif";             
	img122on = new Image();
        img122on.src = "images/track3_nav_on.gif";             
	img123on = new Image();
        img123on.src = "images/track4_nav_on.gif";             
	img124on = new Image();
        img124on.src = "images/track5_nav_on.gif";             
	img125on = new Image();
        img125on.src = "images/track6_nav_on.gif";             
	img126on = new Image();
        img126on.src = "images/track7_nav_on.gif";             
	img127on = new Image();
        img127on.src = "images/track8_nav_on.gif";             
	img129on = new Image();
        img129on.src = "images/spkr_ag_on.gif";
	img130on = new Image();
        img130on.src = "images/spkr_ho_on.gif";
	img131on = new Image();
        img131on.src = "images/spkr_pz_on.gif";

    
	img120off = new Image();              //create mouseover image objects
        img120off.src = "images/track1_nav_off.gif";             
	img121off = new Image();
        img121off.src = "images/track2_nav_off.gif";             
	img122off = new Image();
        img122off.src = "images/track3_nav_off.gif";             
	img123off = new Image();
        img123off.src = "images/track4_nav_off.gif";             
	img124off = new Image();
        img124off.src = "images/track5_nav_off.gif";             
	img125off = new Image();
        img125off.src = "images/track6_nav_off.gif";             
	img126off = new Image();
        img126off.src = "images/track7_nav_off.gif";             
	img127off = new Image();
        img127off.src = "images/track8_nav_off.gif";             
	img129off = new Image();
        img129off.src = "images/spkr_ag_off.gif";
	img130off = new Image();
        img130off.src = "images/spkr_ho_off.gif";
	img131off = new Image();
        img131off.src = "images/spkr_pz_off.gif";

}

//open secwin for session abstracts
function openAbstract(URL) {
aWindow=window.open(URL, "thewindow", "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width=570,height=480,top=5,left=5");
}