if(navigator.appVersion.charAt(0) >= 3){
var img = new Array();
img[0]=new Image();img[0].src = "images/bt_top.gif";
img[1]=new Image();img[1].src = "images/bt_top_ro.gif";
img[2]=new Image();img[2].src = "images/bt_01.gif";
img[3]=new Image();img[3].src = "images/bt_01_ro.gif";
img[4]=new Image();img[4].src = "images/bt_02.gif";
img[5]=new Image();img[5].src = "images/bt_02_ro.gif";
img[6]=new Image();img[6].src = "images/bt_03.gif";
img[7]=new Image();img[7].src = "images/bt_03_ro.gif";
img[8]=new Image();img[8].src = "images/bt_04.gif";
img[9]=new Image();img[9].src = "images/bt_04_ro.gif";
img[10]=new Image();img[10].src = "images/bt_link_01.gif";
img[11]=new Image();img[11].src = "images/bt_link_01_ro.gif";
img[12]=new Image();img[12].src = "images/bt_link_02.gif";
img[13]=new Image();img[13].src = "images/bt_link_02_ro.gif";
img[14]=new Image();img[14].src = "images/bt_link_03.gif";
img[15]=new Image();img[15].src = "images/bt_link_03_ro.gif";
img[16]=new Image();img[16].src = "images/bt_link_04.gif";
img[17]=new Image();img[17].src = "images/bt_link_04_ro.gif";
img[18]=new Image();img[18].src = "images/bt_link_05.gif";
img[19]=new Image();img[19].src = "images/bt_link_05_ro.gif";
}
function change_image(nam,num){
if(navigator.appVersion.charAt(0) >= 3){
document.images[nam].src = img[num].src;
}
}