// Detect if browser is Netscape 3 + or IE 4 +.
bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
    if ((bName == "Netscape" && bVer >= 3) || 
        (bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3"; 
    else br = "n2";

// Create image objects, preload all active and inactive images.
    if (br== "n3") { 
    img1on = new Image();                       //Images are Hot
    img1on.src = "../images/agricultural-on.gif";     
    img2on = new Image();           
    img2on.src = "../images/support-on1.gif";
    img3on = new Image();           
    img3on.src = "../images/info-on1.gif";
    img4on = new Image();           
    img4on.src = "../images/studies-on.gif";      

    
    
    img1off = new Image();          
    img1off.src = "../images/agricultural.gif";      //Images UNHOT
    img2off = new Image();          
    img2off.src = "../images/support1.gif";   
    img3off = new Image();          
    img3off.src = "../images/info1.gif";
    img4off = new Image();          
    img4off.src = "../images/studies.gif";  
      
    }

// Function to "activate" images.
function imgAct(imgName) {
    if (br == "n3") {
    document[imgName].src= eval(imgName + "on.src");
    
   }
}

// Function to "deactivate" images.
function imgInact(imgName) {
    if (br == "n3") {
    document[imgName].src= eval(imgName + "off.src");
    
   }
}