if (document.images) {            // Active Images
	
	// nav headers
	img1on = new Image();      
	img1on.src = "/graphics/leftNav_TOXICS.gif";
	img1off = new Image(); 
	img1off.src = "/graphics/leftNav_TOXICS.gif";
	
	img2on = new Image();      
	img2on.src = "/graphics/leftNav_AIR.gif";
	img2off = new Image(); 
	img2off.src = "/graphics/leftNav_AIR.gif";
	
	img3on = new Image();      
	img3on.src = "/graphics/leftNav_WATER.gif";
	img3off = new Image(); 
	img3off.src = "/graphics/leftNav_WATER.gif";
	
	img4on = new Image();      
	img4on.src = "/graphics/leftNav_AG.gif";
	img4off = new Image(); 
	img4off.src = "/graphics/leftNav_AG.gif";
	
	img5on = new Image();      
	img5on.src = "/graphics/leftNav_EJ.gif";
	img5off = new Image(); 
	img5off.src = "/graphics/leftNav_EJ.gif";
	
	img6on = new Image();      
	img6on.src = "/graphics/leftNav_HH.gif";
	img6off = new Image(); 
	img6off.src = "/grapics/leftNav_HH.gif";
	
	// nav subheaders
	imgaon = new Image();      
	imgaon.src = "/graphics/leftNav_toxicChem-over.gif";
	imgaoff = new Image(); 
	imgaoff.src = "/graphics/leftNav_toxicChem.gif";
	
	imgbon = new Image();      
	imgbon.src = "/graphics/leftNav_leadHaz-over.gif";
	imgboff = new Image(); 
	imgboff.src = "/graphics/leftNav_leadHaz.gif";
	
	imgcon = new Image();      
	imgcon.src = "/graphics/leftNav_superfund-over.gif";
	imgcoff = new Image(); 
	imgcoff.src = "/graphics/leftNav_superfund.gif";
	
	imgdon = new Image();      
	imgdon.src = "/graphics/leftNav_smogPart-over.gif";
	imgdoff = new Image(); 
	imgdoff.src = "/graphics/leftNav_smogPart.gif";
	
	imgeon = new Image();      
	imgeon.src = "/graphics/leftNav_hazPoll-over.gif";
	imgeoff = new Image(); 
	imgeoff.src = "/graphics/leftNav_hazPoll.gif";
	
	imgfon = new Image();      
	imgfon.src = "/graphics/leftNav_cleanAct-over.gif";
	imgfoff = new Image(); 
	imgfoff.src = "/graphics/leftNav_cleanAct.gif";
	
	imggon = new Image();      
	imggon.src = "/graphics/leftNav_watershed-over.gif";
	imggoff = new Image(); 
	imggoff.src = "/graphics/leftNav_watershed.gif";
	
	imghon = new Image();      
	imghon.src = "/graphics/leftNav_animalWaste-over.gif";
	imghoff = new Image(); 
	imghoff.src = "/graphics/leftNav_animalWaste.gif";
	
	imgion = new Image();      
	imgion.src = "/graphics/leftNav_commCenter-over.gif";
	imgioff = new Image(); 
	imgioff.src = "/graphics/leftNav_commCenter.gif";
	
	imgjon = new Image();      
	imgjon.src = "/graphics/leftNav_espanol-over.gif";
	imgjoff = new Image(); 
	imgjoff.src = "/graphics/leftNav_espanol.gif";
	
	imgkon = new Image();      
	imgkon.src = "/graphics/leftNav_chemProf-over.gif";
	imgkoff = new Image(); 
	imgkoff.src = "/graphics/leftNav_chemProf.gif";
	
	imglon = new Image();      
	imglon.src = "/graphics/leftNav_healthEffects-over.gif";
	imgloff = new Image(); 
	imgloff.src = "/graphics/leftNav_healthEffects.gif";
	
	imgmon = new Image();      
	imgmon.src = "/graphics/leftNav_regulations-over.gif";
	imgmoff = new Image(); 
	imgmoff.src = "/graphics/leftNav_regulations.gif";

}

// Function to 'activate' images.
function imgOn(imgName) {
    if (document.images) {
        document[imgName].src = eval(imgName + "on.src");
    }
}

// Function to 'deactivate' images.
function imgOff(imgName) {
    if (document.images && document[imgName]) {
        document[imgName].src = eval(imgName + "off.src");
    }
}