browserName = navigator.appName;          
         browserVer = parseInt(navigator.appVersion);  
             if (browserName == "Netscape" && (browserVer >= 3 || navigator.appVersion.indexOf("OS/2") != -1)) version = "n3";
             else version = "n2";

if (document.images) {

M01 = new Image(90, 22);M01.src = 'nav/but01-1.gif';
M01_ = new Image(90, 22);M01_.src = 'nav/but01-2.gif';

M02 = new Image(74, 22);M02.src = 'nav/but02-1.gif';
M02_ = new Image(74, 22);M02_.src = 'nav/but02-2.gif';

M03 = new Image(92, 22);M03.src = 'nav/but03-1.gif';
M03_ = new Image(92, 22);M03_.src = 'nav/but03-2.gif';

M04 = new Image(61, 22);M04.src = 'nav/but04-1.gif';
M04_ = new Image(61, 22);M04_.src = 'nav/but04-2.gif';

M05 = new Image(47, 22);M05.src = 'nav/but05-1.gif';
M05_ = new Image(47, 22);M05_.src = 'nav/but05-2.gif';

M06 = new Image(68, 22);M06.src = 'nav/but06-1.gif';
M06_ = new Image(68, 22);M06_.src = 'nav/but06-2.gif';

}

function di(id,name){
  if (document.images) {document.images[id].src=eval(name+".src"); }
}