function pageJump(obj){
obj = obj.form;
for (cnt = 0;cnt < obj.url.length;cnt++) {
if (obj.url[cnt].checked) {
var url = obj.url[cnt].value;
}
}
window.location.href = url;
}
<FORM> <INPUT type="radio" name="url" value="./h_all_top.html" checked>Web 覚書トップ <INPUT type="radio" name="url" value="./h_all_hist.html">更新履歴 <INPUT type="radio" name="url" value="./h_js_top.html">JavaScript サンプル <INPUT type="button" value="移動" onClick="pageJump(this);"> </FORM>