function imgOn(imgName) {
	if (document.images) { 
		document[imgName].src = eval(imgName + "on.src");        
	}	
}
function imgOff(imgName) {
	if (document.images) { 
		document[imgName].src = eval(imgName + "off.src");        
	}	
}

if (document.images) {
	img1on = new Image();
	img1on.src = "images/nav/locations_on.gif";  
	img2on = new Image();
	img2on.src = "images/nav/about_on.gif";  
	img3on = new Image();
	img3on.src = "images/nav/contact_on.gif";  

	imgGoon = new Image();
	imgGoon.src = "images/go_on.gif"; 
	imgSubmiton = new Image();
	imgSubmiton.src = "images/submit_on.gif"; 
	imgBookon = new Image();
	imgBookon.src = "images/click_to_book_on.gif";
				
	img1off = new Image();
	img1off.src = "images/nav/locations.gif";  
	img2off = new Image();
	img2off.src = "images/nav/about.gif";  
	img3off = new Image();
	img3off.src = "images/nav/contact.gif";  				

	imgGooff = new Image();
	imgGooff.src = "images/go.gif"; 
	imgSubmitoff = new Image();
	imgSubmitoff.src = "images/submit.gif"; 
	imgBookoff = new Image();
	imgBookoff.src = "images/click_to_book.gif"; 
}