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<form name=”myform” action=”” method=”” onsubmit=”return check()”>
 <input type=”radio” name=”picno” value=”1″>选择1
 <input type=”radio” name=”picno” value=”2″>选择2
 <input type=”radio” name=”picno” value=”3″>选择3

 <input type=”submit” value=”Submit”>
 <input type=”reset” value=”Reset”>
</form>

<script language=”JavaScript”>
  function check(){
    var flag=0;
    for(i=0;i<myform.picno.length;i++)
    if(myform.picno[i].checked==true){
      flag=1;
      break;
    }
    if(!flag){
      alert(“请先选择！”);
      return false;
    }
  }
</script>