if (document.images) {
       button1 = new Image
       button1b = new Image
       button2 = new Image
       button2b = new Image
       button3 = new Image
       button3b = new Image
       button4 = new Image
       button4b = new Image
       button5 = new Image
       button5b = new Image
       button6 = new Image
       button6b = new Image
       button7 = new Image
       button7b = new Image
       button8 = new Image
       button8b = new Image
       button9 = new Image
       button9b = new Image
       button10 = new Image
       button10b = new Image
       button11 = new Image
       button11b = new Image
       button12 = new Image
       button12b = new Image

       button1.src = "image/postal_button.gif"
       button1b.src = "image/postal_button2.gif"
       button2.src = "image/bubble_button.gif"
       button2b.src = "image/bubble_button2.gif"
       button3.src = "image/corrugated_button.gif"
       button3b.src = "image/corrugated_button2.gif"
       button4.src = "image/polythene_button.gif"
       button4b.src = "image/polythene_button2.gif"
       button5.src = "image/paper_button.gif"
       button5b.src = "image/paper_button2.gif"
       button6.src = "image/cushioning_button.gif"
       button6b.src = "image/cushioning_button2.gif"
       button7.src = "image/strapping_button.gif"
       button7b.src = "image/strapping_button2.gif"
       button8.src = "image/stretch_button.gif"
       button8b.src = "image/stretch_button2.gif"
       button9.src = "image/tapes_button.gif"
       button9b.src = "image/tapes_button2.gif"
       button10.src = "image/accessories_button.gif"
       button10b.src = "image/accessories_button2.gif"
       button11.src = "image/machinery_button.gif"
       button11b.src = "image/machinery_button2.gif"
       button12.src = "image/reference_button.gif"
       button12b.src = "image/reference_button2.gif"
    }
    else {

       button1 = ""
       button1b = ""
       button2 = ""
       button2b = ""
       button3 = ""
       button3b = ""
       button4 = ""
       button4b = ""
       button5 = ""
       button5b = ""
       button6 = ""
       button6b = ""
       button7 = ""
       button7b = ""
       button8 = ""
       button8b = ""
       button9 = ""
       button9b = ""
       button10 = ""
       button10b = ""
       button11 = ""
       button11b = ""
       button12 = ""
       button12b = ""

       document.select1 = ""
       document.select2 = ""
       document.select3 = ""
       document.select4 = ""
       document.select5 = ""
       document.select6 = ""
       document.select7 = ""
       document.select8 = ""
       document.select9 = ""
       document.select10 = ""
       document.select11 = ""
       document.select12 = ""

     }