if (document.images) {
     button1 = new Image
     button2 = new Image
     button3 = new Image
     button4 = new Image
     button5 = new Image
     button6 = new Image
     button7 = new Image
     button8 = new Image

     button1.src = '../images/btn_testimonials.gif'
     button2.src = '../images/btn_testimonials_o.gif'
     button3.src = '../images/btn_competition.gif'
     button4.src = '../images/btn_competition_o.gif'
     button5.src = '../images/btn_video.gif'
     button6.src = '../images/btn_video_o.gif'
     button7.src = '../images/btn_wallpapers.gif'
     button8.src = '../images/btn_wallpapers_o.gif'
 }