if (document.images)
   {
		pic1on= new Image(37,21);
     	pic1on.src="imgs/home_on.gif";
     	pic2on= new Image(56,21);
     	pic2on.src="imgs/about_on.gif";
     	pic3on= new Image(81,21);
     	pic3on.src="imgs/news_on.gif";
    	pic4on= new Image(63,21);
     	pic4on.src="imgs/contact_on.gif";
    	pic5on= new Image(34,21);
     	pic5on.src="imgs/links_on.gif";

        pic1off= new Image(37,21);
     	pic1off.src="imgs/home_off.gif";
        pic2off= new Image(56,21);
     	pic2off.src="imgs/about_off.gif";
      	pic3off= new Image(81,21);
     	pic3off.src="imgs/news_off.gif";
    	pic4off= new Image(63,21);
     	pic4off.src="imgs/contact_off.gif";
    	pic5off= new Image(34,21);
     	pic5off.src="imgs/links_off.gif";
   }

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

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