if (document.images)


   {


     pic1on= new Image(237,24);


     pic1on.src="nav/home_on.gif";


     pic2on= new Image(237,24);


     pic2on.src="nav/dissolved_air_flotation_systems_on.gif";


     pic3on= new Image(237,24);


     pic3on.src="nav/recessed_chamber_filter_presses_on.gif";


     pic4on= new Image(237,24)


     pic4on.src="nav/mobile_filter_presses_on.gif";


     pic5on= new Image(237,24)


     pic5on.src="nav/mobile_belt_presses_on.gif";


     pic6on= new Image(237,24)


     pic6on.src="nav/lamella_clarifiers_on.gif";


     pic7on= new Image(237,24);


     pic7on.src="nav/belt_filter_presses_on.gif";


     pic8on= new Image(303,42);


     pic8on.src="nav/return_on.gif";


     pic9on= new Image(303,42);


     pic9on.src="nav/return_on.gif";





     pic1off= new Image(237,24);


     pic1off.src="nav/home_off.gif";


     pic2off= new Image(237,24);


     pic2off.src="nav/dissolved_air_flotation_systems_off.gif";


     pic3off= new Image(237,24);


     pic3off.src="nav/recessed_chamber_filter_presses_off.gif";


     pic4off= new Image(237,24)


     pic4off.src="nav/mobile_filter_presses_off.gif";


     pic5off= new Image(237,24)


     pic5off.src="nav/mobile_belt_presses_off.gif";


     pic6off= new Image(237,24)


     pic6off.src="nav/lamella_clarifiers_off.gif";


     pic7off= new Image(237,24);


     pic7off.src="nav/belt_filter_presses_off.gif";


     pic8off= new Image(303,42);


     pic8off.src="nav/return_off.gif";


     pic9off= new Image(303,42);


     pic9off.src="nav/return_off.gif";


   }





function turnon(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;


    }


 }