if(navigator.appVersion.charAt(0) >= "3") {
var img = new Array();
	img[0] = new Image(); img[0].src = "../register/img/btn_back.gif";
	img[1] = new Image(); img[1].src = "../register/img/btn_back_on.gif";
}
function _in(nam,num) {
if(navigator.appVersion.charAt(0) >= "3") {
document.images[nam].src = img[num].src;
} else { }
}
function _out(nam,num) {
document.images[nam].src = img[num].src;
}