How to uncheck the checked box
<p>How to uncheck the checked box if another one is checked. </p>

<p>Could someone help. </p>

<p>Thanks. </p>

<pre><code>&lt;?php

//limit for number of categories displied per page
$limit = 4;

$categoriesNum= mysql_query("SELECT COUNT('categoryTopic') FROM categories");   

//number of current page
$page =(isset($_GET['page']))? (int) $_GET['page'] :1;

//calculate the current page number 
$begin =($page - 1)* $limit; 

//number of pages needed. 
$pagesCount =ceil(mysql_result ($categoriesNum,0)/$limit);

//Query up all the Categories with setting the Limit 
$CategoryQuery = mysql_query ("SELECT categoryTopic From categories ORDER BY categoryTopic LIMIT $begin, $limit");

//Place all categories in an array then loop throuhgt it diaplaying them one by one
while ($query_rows = mysql_fetch_assoc($CategoryQuery))
{

    $category =$query_rows['categoryTopic'];  
    //echo $category; 
    //qurery all the subcategories that the current category has 
    $Sub = mysql_query ("SELECT categoryTopic FROM subcategories WHERE categoryTopic='$category'");             
    $Count = mysql_num_rows ($Sub); 

    echo  '&lt;table width="85%" border="1"  cellpadding="0"; cellspacing="0" align="center"&gt;

    &lt;tr&gt;        
        &lt;th width="23%" height="44" scope="col" align="left"&gt; '.$query_rows['categoryTopic'].' &lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;/th&gt;
        &lt;th width="24%" scope="col"&gt;'.$Count.'&lt;/th&gt;
        &lt;th width="25%" scope="col"&gt; 0 &lt;/th&gt;
        &lt;th width="28%" scope="col"&gt; &lt;form  name = "choose"&gt;
        &lt;label&gt;&lt;input type="checkbox" id ="check" value= '.$category.' onchange="handleChange(this);"&gt;&lt;/label&gt;
    &lt;/tr&gt;
&lt;/table&gt;';  
}
?&gt; 

&lt;script type="text/jscript"&gt;
//this funciton will be called when user checks a check box. 

function handleChange(cb) {


//get the selected category 
var category = cb.value;
</code></pre>

<p>if another one gets selected I get the value of the new one but two boxes are checked at the same time. </p>
