if (document.images) {
            button1 = new Image
            button1r = new Image
            button2 = new Image
            button2r = new Image
            button3 = new Image
            button3r = new Image
            button4 = new Image
            button4r = new Image
            button5 = new Image
            button5r = new Image
            button6 = new Image
            button6r = new Image

            button1.src = 'images/nav_home.gif'
            button1r.src = 'images/nav_home_hover.gif'
            button2.src = 'images/nav_profile.gif'
            button2r.src = 'images/nav_profile_hover.gif'
            button3.src = 'images/nav_services.gif'
            button3r.src = 'images/nav_services_hover.gif'
            button4.src = 'images/nav_contactus.gif'
            button4r.src = 'images/nav_contactus_hover.gif'
            button5.src = 'images/nav_jobseeker.gif'
            button5r.src = 'images/nav_jobseeker_hover.gif'
            button6.src = 'images/nav_login.gif'
            button6r.src = 'images/nav_login_hover.gif'
        }