if (document.images) {
         button1on = new Image()
         button1on.src = "nav/home-plans-on.jpg"
         button2on = new Image()
         button2on.src = "nav/contractors-on.jpg"
         button3on = new Image()
         button3on.src = "nav/history-on.jpg"
         button4on = new Image()
         button4on.src = "nav/online-catalog-on.jpg"
         button5on = new Image()
         button5on.src = "nav/locations-on.jpg"
         button6on = new Image()
         button6on.src = "nav/lampert-exteriors-on.jpg"
         button7on = new Image()
         button7on.src = "nav/industry-links-on.jpg"
         button8on = new Image()
         button8on.src = "nav/contact-uss-on.jpg"
         button9on = new Image()
         button9on.src = "nav/home-on.jpg"

         button1off = new Image()
         button1off.src = "nav/home-plans-off.jpg"
         button2off = new Image()
         button2off.src = "nav/contractors-off.jpg"
         button3off = new Image()
         button3off.src = "nav/history-off.jpg"
         button4off = new Image()
         button4off.src = "nav/online-catalog-off.jpg"
         button5off = new Image()
         button5off.src = "nav/locations-off.jpg"
         button6off = new Image()
         button6off.src = "nav/lampert-exteriors-off.jpg"
         button7off = new Image()
         button7off.src = "nav/industry-links-off.jpg"
         button8off = new Image()
         button8off.src = "nav/contact-uss-off.jpg"
         button9off = new Image()
         button9off.src = "nav/home-off.jpg"
         }
      function imgOn(imgName) {
         if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
         }
      }
      function imgOff(imgName) {
         if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
         }
      } 


function contractscreen() {
                window.open("","contract","left=20,top=0,width=400,height=400,resizable=no,toolbar=no,location=no,directories=no,scrollbars=no")
                } 

function locationscreen() {
                window.open("","location","left=20,top=0,width=400,height=400,resizable=no,toolbar=no,location=no,directories=no,scrollbars=no")
                } 

function contactscreen() {
                window.open("","contact","left=20,top=0,width=400,height=400,resizable=no,toolbar=no,location=no,directories=no,scrollbars=no")
                }