{	
	overview0=new Image();
	overview0.src= "images/nav-overview-off.gif"; 
	overview1=new Image();
	overview1.src= "images/nav-overview-on.gif";
	overview2=new Image();
	overview2.src= "images/nav-overview-select.gif";  
	
	speakers0=new Image();
	speakers0.src= "images/nav-speakers-off.gif"; 
	speakers1=new Image();
	speakers1.src= "images/nav-speakers-on.gif";
	speakers2=new Image();
	speakers2.src= "images/nav-speakers-select.gif"; 
	
	agenda0=new Image();
	agenda0.src= "images/nav-agenda-off.gif"; 
	agenda1=new Image();
	agenda1.src= "images/nav-agenda-on.gif";
	agenda2=new Image();
	agenda2.src= "images/nav-agenda-select.gif"; 
	
	hall0=new Image();
	hall0.src= "images/nav-hall-off.gif"; 
	hall1=new Image();
	hall1.src= "images/nav-hall-on.gif";
	hall2=new Image();
	hall2.src= "images/nav-hall-select.gif"; 
	
	travel0=new Image();
	travel0.src= "images/nav-travel-off.gif"; 
	travel1=new Image();
	travel1.src= "images/nav-travel-on.gif";
	travel2=new Image();
	travel2.src= "images/nav-travel-select.gif"; 
	
	registration0=new Image();
	registration0.src= "images/nav-registration-off.gif"; 
	registration1=new Image();
	registration1.src= "images/nav-registration-on.gif";
	registration2=new Image();
	registration2.src= "images/nav-registration-select.gif"; 
}
	

function navOn(imgName) {
	if (document.images) {
		if (document.images[imgName].src != eval(imgName + '2.src')) {
			document.images[imgName].src = eval(imgName + '1.src');
		}
	}
}

function navOff(imgName) {
	if (document.images) {
		if (document.images[imgName].src != eval(imgName + '2.src')) {
			document.images[imgName].src = eval(imgName + '0.src');
		}
	}
}

function navSelect(imgName) {
	if (document.images) {
		document.images[imgName].src = eval(imgName + '2.src');
	}
}

function snavSelect(navName) {
	if (document.getElementById) {
		document.getElementById(navName).style.background = 'url(images/arrow-subnav-on.gif) top left no-repeat';
		document.getElementById(navName).style.fontWeight = 'bold';
	}
}