There are two tables in a page. One is for Friday and other is for Saturday. I want to set the choice limit of radio button selection from a table. User can not select more than 3 slots out of 4 slots from Friday table. How can I call a javascript function for a table? How can I do this? 
Here is my php code and javascript function. [![Output looks like this](https://i.stack.imgur.com/MDXzw.jpg)](https://i.stack.imgur.com/MDXzw.jpg)

This javascript function is working for both table. When I select 3 radio button from any table it shows "You can not add more than 3". But I want this only for Friday table not for Saturday.

1. PHP code:

```
              for($time=0; $time<4; $time++){
                $q.= "<td colspan='1' valign='top' width='25%'>";
                    $q.= "<table id='ash'>";
                    $q.= "<tr id='grey'>";
                    if($day==1){
                        if($time==0){
                            $q.= "<th width='50%'></th></tr>";
                        }else if($time==1){
                            $q.= "<th width='50%'></th></tr>";
                        }else if($time==2){
                            $q.= "<th>Reg.</th>";
                            $q.= "<th width='50%'>2:30 pm - 5:00 pm</th>";
                            $q.= "<th>Sec</th><th>Remaining</th></tr>";
                        }else{
                            $q.= "<th>Reg.</th>";
                            $q.= "<th width='50%'>5:00 pm - 7:30 pm</th>";
                            $q.= "<th>Sec</th><th>Remaining</th></tr>";
                        }
                    } 
                  else{
                        $q.= "<th>Reg.</th>";
                        if($time==0){
                            $q.= "<th width='50%'>8:30 am - 11:00 am</th>";
                        }else if($time==1){
                            $q.= "<th width='50%'>11:00 am - 1:30 pm</th>";
                        }else if($time==2){
                            $q.= "<th width='50%'>2:30 pm - 5:00 pm</th>";
                        }else{
                            $q.= "<th width='50%'>5:00 pm - 7:30 pm</th>";
                        }
                        $q.= "<th>Sec</th><th>Remaining</th></tr>";
                    }
                    $query1 = "SELECT tab1.*, tab2.course_name, tab2.course_type FROM routine AS tab1, course_info AS tab2"; 
                    $result = mysql_query($query1);
                    if ($result && mysql_num_rows($result) > 0) {
                        while($row = mysql_fetch_assoc($result)){
                            $course = $row["course_code"];
                            $sec = $row["section"];
                            $type = $row["course_type"];
                            if(course_completed($std_id, $course)){
                                if(already_selected($course, $sec, $std_id, $year, $sem)){
                                    $q.= "<tr bgcolor='#00FF33'><td><input type='radio' id='course_".$day."_".$time."' name='".$day.$time."' value='".$course.",".$sec.",".$type."' checked='checked' onclick='changeRadioValue(\"".$day."_".$time."\")' /></td>";
                                }
                                else{
                                    $q.= "<tr bgcolor='#00FF33'><td><input type='radio' id='course_".$day."_".$time."' name='".$day.$time."' value='".$course.",".$sec.",".$type."' onclick='changeRadioValue(\"".$day."_".$time."\")' /></td>";
                                }
                            }

                       else{

                                if(already_selected($course, $sec, $std_id, $year, $sem)){
                                    $q.= "<tr><td><input type='radio' id='course_".$day."_".$time."' name='".$day.$time."' value='".$course.",".$sec.",".$type."' checked='checked' onclick='changeRadioValue(\"".$day."_".$time."\")' /></td>";
                                }else{
                                    $q.= "<tr><td><input type='radio' id='course_".$day."_".$time."' name='".$day.$time."' value='".$course.",".$sec.",".$type."' onclick='changeRadioValue(\"".$day."_".$time."\")' /></td>";
                                }
                            }

```
2. JavaScript function

```
$("input[type='radio']").change(function(){
    var count = $("input[type='radio']:checked").length;
    if(count>3){
        $(this).prop('checked', false);
      alert("You cannot add more than 3");
    }
});

```