当选择类似此功能的单选按钮时，如何销毁id中的数据

选择这样的单选按钮时，如何销毁id中的数据？

第一个加载页面index.php，

1. 按Check1按钮，您将看到文本PRODUCTS DATA OK
2. 选中单选按钮SECOND RADIO
3. 选中单选按钮FIRST RADIO
4. 您将看到文本PRODUCTS DATA OK

这是我在步骤2. checked radio button SECOND RADIO中的问题选中单选按钮SECOND RADIO后，我想销毁文本PRODUCTS DATA OK存储在<p id="myplace_data1"></p> 中

我该怎么做？

index.php

<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<script>
    $(document).ready(function(){
        $(".radio_id").click(function(){
            if($(this).attr("value")=="first"){
                $("#second_checkbox").hide();                
                $("#first_checkbox_display").show();
            }
            if($(this).attr("value")=="second"){
                $("#first_checkbox_display").hide();                
                $("#second_checkbox").show();    
            }
        });
    });
</script>

<form id="first_checkbox_display" name="form1" method="post" action="" ENCTYPE = "multipart/form-data" onsubmit="return checkform(this);" style=" margin: 0px; " >
<input type="text" name="products_id" value="1294759">
<input type="text" name="products_color" value="red">
<input type="text" name="products_type" value="electronic">
<input type="button" value="Check1" onclick="doajax_products_check()"/>
<p id="myplace_data1"></p>
</form>

<form id="second_checkbox" name="form2" method="post" action="" ENCTYPE = "multipart/form-data" onsubmit="return checkform(this);" style=" display: none; margin: 0px; " >
<input type="text" name="products_id" value="0000000">
<input type="text" name="products_color" value="iiiiiii">
<input type="text" name="products_type" value="aaaaaaa">
<input type="button" value="Check2" onclick="doajax_products_check2()"/>
<p id="myplace_data2"></p>
</form>
<br>
<br>
<label><input type="radio" class="radio_id" name="colorRadio" value="first" checked >FIRST RADIO</label>
<br>
<label><input type="radio" class="radio_id" name="colorRadio" value="second">SECOND RADIO</label>


<script language="javascript">
function createAjax() 
{
    var request = false;
        try {
                request = new ActiveXObject('Msxml2.XMLHTTP');
            }
        catch (err2) 
            {
                try 
                    {
                        request = new ActiveXObject('Microsoft.XMLHTTP');
                    }
                catch (err3) 
                    {
                try 
                           {
                    request = new XMLHttpRequest();
                   }
                catch (err1) 
                   {
                    request = false;
                   }
                    }
            }
    return request;
}
</script>

<script language="javascript">
function doajax_products_check(mydata){
 var ajax1=createAjax(); 
 ajax1.onreadystatechange=function(){
  if(ajax1.readyState==4 && ajax1.status==200){
   document.getElementById('myplace_data1').innerHTML=ajax1.responseText;
  }else{
   return false;
  }
 }
 ajax1.open("POST","data.php",true);
 ajax1.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
 ajax1.send("products_color="+document.form1.products_color.value+"&products_type="+document.form1.products_type.value+"&products_id="+document.form1.products_id.value);
}
</script>




<script language="javascript">
function doajax_products_check2(mydata){
 var ajax1=createAjax(); 
 ajax1.onreadystatechange=function(){
  if(ajax1.readyState==4 && ajax1.status==200){
   document.getElementById('myplace_data2').innerHTML=ajax1.responseText;
  }else{
   return false;
  }
 }
 ajax1.open("POST","data.php",true);
 ajax1.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
 ajax1.send("products_color="+document.form2.products_color.value+"&products_type="+document.form2.products_type.value+"&products_id="+document.form2.products_id.value);
}
</script>

data.php

<?PHP
if(isset($_POST['products_color']))
    {
        if ( $_POST['products_id'] != '' )
            { 
                if ( $_POST['products_type'] != '' )
                    {  
?>
                        <span class="taken_domain" style=" display: block; margin: 0 auto; " >PRODUCTS DATA OK</span> 
<?PHP
                    }
                 else
                    {
?>
                        <span class="taken_domain" style=" display: block; margin: 0 auto; " >NO PRODUCTS type</span> 
<?PHP
                    }
            }
        else
            { 
?>             
                <span class="taken_domain" style=" display: block; margin: 0 auto; " >NO PRODUCTS ID</span>             
<?PHP                
            }
    }
else
    {
?>
        <span class="taken_domain" style=" display: block; margin: 0 auto; " >NO PRODUCTS COLOR</span>    
<?PHP    
    }    
?>