var menuImg0 = "pictures/navigation_logo1.jpg"; //Default Image on the left and right
	var menuImg1 = "pictures/navigation_logo2.jpg"; //Image to show up on the left when mouse hovers over the link	
	var menuImg2 = "pictures/navigation_logo1.jpg"; // Image to show up on the right when mouse hovers over the link
	/*
	Function to be called when mouse hovers over the navigation
	links
	*/
	function navigation_mouse_over(imgName,imgNamer) {
			document.getElementById(imgName).src = menuImg1;
			document.getElementById(imgNamer).src = menuImg2;
		}
	// Function to be called when mouse out
	function navigation_mouse_out(imgName,imgNamer) {
			document.getElementById(imgName).src = menuImg0;
			document.getElementById(imgNamer).src = menuImg0;	
		}