if (document.images) {            // Active Images
	img1on = new Image();      
    img1on.src = "res/nav_oilspill-over.gif"; 
	img2on = new Image();      
    img2on.src = "res/nav_fish-over.gif"; 
	img3on = new Image();      
    img3on.src = "res/nav_quality-over.gif"; 
	img4on = new Image();      
    img4on.src = "res/nav_birds-over.gif"; 
	img5on = new Image();      
    img5on.src = "res/nav_mammals-over.gif";
	img6on = new Image();      
    img6on.src = "res/nav_cleanup-over.gif";
	img7on = new Image();      
    img7on.src = "res/nav_shoreline-over.gif";
	img8on = new Image();      
    img8on.src = "res/nav_availability-over.gif";
	img9on = new Image();      
    img9on.src = "res/nav_hydrocarbon-over.gif";
	img10on = new Image();      
    img10on.src = "res/nav_oilpersistance-over.gif";
	img11on = new Image();      
    img11on.src = "res/nav_industrial-over.gif";
	img12on = new Image();      
    img12on.src = "res/nav_naturaloil-over.gif";
	img13on = new Image();      
    img13on.src = "res/nav_views-over.gif";
	img14on = new Image();      
    img14on.src = "res/title_backhome-over.gif";
	img15on = new Image();      
    img15on.src = "res/nav_overview-over.gif";
	img16on = new Image();      
    img16on.src = "res/nav_links-over.gif";
	img17on = new Image();      
    img17on.src = "res/nav_authorlist-over.gif";
	img18on = new Image();      
    img18on.src = "res/nav_PWS-over.gif";
	img19on = new Image();      
    img19on.src = "res/nav_MAYSAP-over.gif";
	img20on = new Image();      
    img20on.src = "res/nav_bioremediation-over.gif";
	img21on = new Image();      
    img21on.src = "res/nav_PAH-over.gif";
	
    img1off = new Image();      
    img1off.src = "res/nav_oilspill.gif"; 
	img2off = new Image();     
    img2off.src = "res/nav_fish.gif"; 
	img3off = new Image();      
    img3off.src = "res/nav_quality.gif"; 
	img4off = new Image();     
    img4off.src = "res/nav_birds.gif"; 
	img5off = new Image();      
    img5off.src = "res/nav_mammals.gif";
	img6off = new Image();      
    img6off.src = "res/nav_cleanup.gif";
	img7off = new Image();      
    img7off.src = "res/nav_shoreline.gif";
	img8off = new Image();      
    img8off.src = "res/nav_availability.gif";	
	img9off = new Image();      
    img9off.src = "res/nav_hydrocarbon.gif";	
	img10off = new Image();      
    img10off.src = "res/nav_oilpersistance.gif";	
	img11off = new Image();      
    img11off.src = "res/nav_industrial.gif";	
	img12off = new Image();      
    img12off.src = "res/nav_naturaloil.gif";	
	img13off = new Image();      
    img13off.src = "res/nav_views.gif";	
	img14off = new Image();      
    img14off.src = "res/title_backhome.gif";	
	img15off = new Image();      
    img15off.src = "res/nav_overview.gif";	
	img16off = new Image();      
    img16off.src = "res/nav_links.gif";	
	img17off = new Image();      
    img17off.src = "res/nav_authorlist.gif";	
	img18off = new Image();      
    img18off.src = "res/nav_PWS.gif";	
	img19off = new Image();      
    img19off.src = "res/nav_MAYSAP.gif";
	img20off = new Image();      
    img20off.src = "res/nav_bioremediation.gif";
	img21off = new Image();      
    img21off.src = "res/nav_PAH.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].src = eval(imgName + "off.src");
        }
}

// Function to open new window.
function openBrWindow(theURL,winName,features) {
  window.open(theURL,winName,features);
}

// Function for text expand/collapse (Article Subsections)
function showHideTable(theTable,theImg)
{
if (document.getElementById(theTable).style.display == 'none')
  {
  document.getElementById(theTable).style.display = 'block';
  document.getElementById(theImg).src='res/contract.gif';
  }
  else
  {
  document.getElementById(theTable).style.display = 'none';
     document.getElementById(theImg).src='res/expand.gif';

  }
}


// -->