var ver4 = (navigator.appVersion.charAt(0) == "4");
var NN4  = ver4 && (navigator.appName == "Netscape");
var IE4 = ver4 && (navigator.appName.charAt(0) == "M");
var NN3 = ((navigator.appVersion.charAt(0) == "3") && (navigator.appName == "Netscape"));

var imgS=new Array();

imgS[1]=new Image();imgS[1].src="/design/museumshop/img_common/menu1.gif";
imgS[2]=new Image();imgS[2].src="/design/museumshop/img_common/menu2.gif";
imgS[3]=new Image();imgS[3].src="/design/museumshop/img_common/menu3.gif";
imgS[4]=new Image();imgS[4].src="/design/museumshop/img_common/menu4.gif";
imgS[5]=new Image();imgS[5].src="/design/museumshop/img_common/menu5.gif";
imgS[11]=new Image();imgS[11].src="/design/museumshop/img_common/menu1_r.gif";
imgS[12]=new Image();imgS[12].src="/design/museumshop/img_common/menu2_r.gif";
imgS[13]=new Image();imgS[13].src="/design/museumshop/img_common/menu3_r.gif";
imgS[14]=new Image();imgS[14].src="/design/museumshop/img_common/menu4_r.gif";
imgS[15]=new Image();imgS[15].src="/design/museumshop/img_common/menu5_r.gif";


function swImg(num,posName) {
        if(NN3 || NN4 || IE4) posName.src = imgS[num].src;
}