img1=new Image; img1b=new Image; 
img1.src="images/nav/home_over.gif"; 
img1b.src="images/nav/home.gif"; 

img2=new Image; img2b=new Image; 
img2.src="images/nav/public_over.gif"; 
img2b.src="images/nav/public.gif"; 

img3=new Image; img3b=new Image; 
img3.src="images/nav/project_over.gif"; 
img3b.src="images/nav/project.gif"; 

img4=new Image; img4b=new Image; 
img4.src="images/nav/feedback_over.gif"; 
img4b.src="images/nav/feedback.gif";