var ie45,ns6,ns4,dom;
    if (navigator.appName=="Microsoft Internet Explorer") ie45=parseInt(navigator.appVersion)>=4;
    else if (navigator.appName=="Netscape"){  ns6=parseInt(navigator.appVersion)>=5;  ns4=parseInt(navigator.appVersion)<5;}
    dom=ie45 || ns6;
  

    function showhide(id) {
             el = document.all ? document.all[id] :   dom ? document.getElementById(id) :   document.layers[id];
             els = dom ? el.style : el;
                      if (dom){
                 if (els.display == "none") {
                     els.display = "";
                   
                 } else {
                     els.display = "none";
                    
                 }
             } else if (ns4){
                        if (els.display == "show") {
                            els.display = "hide";
                            
                        } else {
                            els.display = "show";
                           
                        }
                    }
    }