if (document.images) {				
                  m0on = new Image(52,20);
                  m0on.src="images/m0on.gif"; /*home*/
                  m1on = new Image(100,32);
                  m1on.src="images/m1on.gif"; /*whatwedo*/
                  m2on = new Image(100,32);
                  m2on.src="images/m2on.gif"; /*whoweare*/
                  m3on = new Image(100,32);
                  m3on.src="images/m3on.gif"; /*serviceareas*/
                  m4on = new Image(100,32);
                  m4on.src="images/m4on.gif"; /*casestudies*/
                  m5on = new Image(100,32);
                  m5on.src="images/m5on.gif"; /*newsarticles*/
                  upon = new Image(18,18);
                  upon.src="images/upon.jpg"; /*up*/
                  backon = new Image(18,18);
                  backon.src="images/backon.jpg"; /*back*/
                  goon = new Image(18,18);
                  goon.src="images/goon.jpg"; /*go*/

                  m0off = new Image(52,20);
                  m0off.src="images/m0off.gif";
                  m1off = new Image(100,32);
                  m1off.src="images/m1off.gif";
                  m2off = new Image(100,32);
                  m2off.src="images/m2off.gif"
                  m3off = new Image(100,32);
                  m3off.src="images/m3off.gif";
                  m4off = new Image(100,32);
                  m4off.src="images/m4off.gif";
                  m5off = new Image(100,32);
                  m5off.src="images/m5off.gif";
                  upoff = new Image(18,18);
                  upoff.src="images/upoff.jpg";
                  backoff = new Image(18,18);
                  backoff.src="images/backoff.jpg";
                  gooff = new Image(18,18);
                  gooff.src="images/gooff.jpg";
                  }

function img_act(imgName) {
    if (document.images) {
    document[imgName].src = eval(imgName + "on.src");
    }
}

function img_inact(imgName) {
    if (document.images) {
    document[imgName].src = eval(imgName + "off.src");
    }
}