Browser = false ;
if (((navigator.appName.charAt(0)=="N") && (navigator.appVersion.charAt(0)>=3)) || ((navigator.appName.charAt(0)=="M") && (navigator.appVersion.charAt(0)>=4))) {
    Browser = true;
    
    about_off= new Image();
    about_off.src = "images/nav/about_off.gif";
    about_over = new Image();
    about_over.src = "images/nav/about_over.gif";
    
    blog_off= new Image();
    blog_off.src = "images/nav/blog_off.gif";
    blog_over = new Image();
    blog_over.src = "images/nav/blog_over.gif";
    
    case_off= new Image();
    case_off.src = "images/nav/case_off.gif";
    case_over = new Image();
    case_over.src = "images/nav/case_over.gif";
    
    clients_off= new Image();
    clients_off.src = "images/nav/clients_off.gif";
    clients_over = new Image();
    clients_over.src = "images/nav/clients_over.gif";
    
    resources_off= new Image();
    resources_off.src = "images/nav/resources_off.gif";
    resources_over = new Image();
    resources_over.src = "images/nav/resources_over.gif";
    
    services_off= new Image();
    services_off.src = "images/nav/services_off.gif";
    services_over = new Image();
    services_over.src = "images/nav/services_over.gif";
    

    
    
   
    }    

function rollover(place, imgName) {
    if (Browser == true) {
        document[place].src =eval(imgName + ".src");
    }
}