// preload images

navbutton1 = new Image();

navbutton1.src = "images/homebutton_over.gif";



navbutton2 = new Image();

navbutton2.src = "images/portfoliobutton_over.gif";



navbutton3 = new Image();

navbutton3.src = "images/aboutbutton_over.gif";



navbutton4 = new Image();

navbutton4.src = "images/ratesbutton_over.gif";



navbutton5 = new Image();

navbutton5.src = "images/contactbutton_over.gif";



navbutton6 = new Image();

navbutton6.src = "images/button_down.gif";