//preload images for navigation
nav_home_on = new Image();
nav_home_on = 'images/nav_home_on.gif';

nav_gallery_on = new Image();
nav_gallery_on = 'images/nav_gallery_on.gif';

nav_contact_on = new Image();
nav_contact_on = 'images/nav_contact_on.gif';

nav_testimonials_on = new Image();
nav_testimonials_on = 'images/nav_testimonials_on.gif';
//stop preloadin' images

function navOn(imName) {
		if (document.images) { 
		document.images[imName].src = 'images/' + imName + "_on.gif"
			 };
}
function navOff(imName) {
		if (document.images) { 
		document.images[imName].src = 'images/' + imName + '.gif' 
		};
}