//ブラウザバージョン判定


var IEversion = 0;

var NNversion = 0;



if(navigator.appName.indexOf("Microsoft") >= 0){

        if(navigator.appVersion.charAt (0)==4 ){

                if(navigator.appVersion.indexOf ("MSIE 5") != -1){

                        IEversion = 5;

                }else{

                        IEversion = 4;

                }

        }

} else {

        if(navigator.appName.indexOf("Netscape") >= 0){

                if(navigator.appVersion.charAt(0) ==4){

                        NNversion = 4;

                }else if(navigator.appVersion.charAt(0) ==5){

                        NNversion = 6;

                }

        }

}



<!--レイヤーこの順番でvisible、hiddenする-->

var Layer_name     = new Array('Layer1','Layer2','Layer3','Layer4','Layer5','Layer6');

var Layer_timerID = new Array();

var Layer_sw         = new Array();

for(var i=0;i<Layer_name.length;i++){

        Layer_sw[i] = 'hidden';

}



function Layer_Control() {      //レイヤー変更設定


        LC_Args = Layer_Control.arguments;

        for(var i=0;i<LC_Args.length;i++){

                if(LC_Args[i] && Layer_sw[i] != LC_Args[i]){

                        if(LC_Args[i] == 'timer_hidden'){

                                Layer_timerID[i] = setTimeout("Layer_Change('" + Layer_name[i] + "','hidden')", 700);

                        }else{

                                clearTimeout(Layer_timerID[i]);

                                Layer_Change(Layer_name[i],LC_Args[i]);

                        }

                        Layer_sw[i] = LC_Args[i];

                }

        }

}



function Layer_Change(DIVid,visStr) {   //レイヤー変更

        var theObj;

        if(NNversion == 4 && document.layers != null){  //NN4

                if(visStr == 'visible') visStr = 'show';

                if(visStr == 'hidden') visStr = 'hide';

                theObj = 'document.layers["' + DIVid + '"]';



        }else if((IEversion == 4 || IEversion == 5) && document.all != null){   //IE4,IE5

                theObj = 'document.all["' + DIVid + '"].style';



        }else if(NNversion == 6 && document.getElementById != null){  //nn6

                theObj = 'document.getElementById("' + DIVid + '").style';

        }

        if(theObj){

                theObj = eval(theObj);

                theObj.visibility = visStr;

        }

}

function MM_findObj(n, d) { //v4.01

  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {

    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}

  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];

  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);

  if(!x && d.getElementById) x=d.getElementById(n); return x;

}