var N4 = false;     //netscape 4
var N7 = false;

if (document.layers){
  N4 = true;        //netscape 4

}else if (document.all){
  N4 = false;       //ie 4 & 5
  N7 = false;

}else{            
  N7 = true;        //netscape 6/7 or other
}

var layerRef = (document.all) ? "document.all" : "document.layers";
var stile    = (document.all) ? ".style"       : "";
var vis      = (document.all) ? "visible"      : "show";
var hid      = (document.all) ? "hidden"       : "hide";

var defaultMenu = 'submenu1';

if (N4) {  // netscape 4
  document.writeln("<link rel=\"stylesheet\" type=\"text/css\" href=\"/css/cadswesNet4.css\" />");
} else if (N7) { // netscape 7+
  document.writeln("<link rel=\"stylesheet\" type=\"text/css\" href=\"/css/cadswesIE.css\" />");
} else {    //use for all other browsers
  document.writeln("<link rel=\"stylesheet\" type=\"text/css\" href=\"/css/cadswesIE.css\" />");
}

function activate(layerName) {
  if (N7) {
    eval('document.getElementById("'+layerName+'").style.visibility="visible"');
  } else {
    eval(layerRef+'["'+layerName+'"]'+stile+'.visibility="'+vis+'"');
  }
    
  return false;
}

function deactivate(layerName) {
  if (N7)
    eval('document.getElementById("'+layerName+'").style.visibility="hidden"');
  else
    eval(layerRef+'["'+layerName+'"]'+stile+'.visibility="'+hid+'"');
    
  return false;
}

function gomenu(navname){      
  menuTarget1 = 'submenu1';
  menuTarget2 = 'submenu2';
  menuTarget3 = 'submenu3';
  menuTarget4 = 'submenu4';
  menuTarget5 = 'submenu5';
  menuTarget6 = 'submenu6';
  menuTarget7 = 'submenu7';
  deactivate(menuTarget1);
  deactivate(menuTarget2);
  deactivate(menuTarget3);
  deactivate(menuTarget4);
  deactivate(menuTarget5);
  deactivate(menuTarget6);
  deactivate(menuTarget7);
  activate(navname);
 }
  
function clearmenu(){  
  menuTarget1 = 'submenu1';
  menuTarget2 = 'submenu2';
  menuTarget3 = 'submenu3';
  menuTarget4 = 'submenu4';
  menuTarget5 = 'submenu5';
  menuTarget6 = 'submenu6';
  menuTarget7 = 'submenu7';
  
  //deactivate all the tabs.
  deactivate(menuTarget1);
  deactivate(menuTarget2);
  deactivate(menuTarget3);
  deactivate(menuTarget4);
  deactivate(menuTarget5);
  deactivate(menuTarget6);
  deactivate(menuTarget7);
  
  // activate the current tab.
  activate(defaultMenu);
}