The value of an range from another page

function imgShow(Target)
{
    for(var i = 1; i <= images; i++)
    {
        if(i != Target) 
            document.getElementById('img' + i).style.display = 'none';
        else 
            document.getElementById('img' + i).style.display = 'block';
    }
}

function imgShow(Target)
{
    for(var i = 1; i <= images; i++)
    {
        if(i != Target) 
            document.getElementById('img' + i).style.display = 'none';
        else 
            document.getElementById('img' + i).style.display = 'block';
    }
}

<input type="range" id="slider" max="<?php echo ($images*1); ?>" min="1"
       value="1" onchange="imgShow(parseInt(this.value/1));" />
<output>
<?php 
    for ($i = 0; $i < $images; $i++)
    {
        $image = $files[$i];
        echo '<div id="img' . ($i+1) . '" class="photo" style=""><img src="' . $image . '" /></div>';
    }
?>
</output>

<input type="range" id="slider" max="<?php echo ($images*1); ?>" min="1"
       value="1" onchange="imgShow(parseInt(this.value/1));" />
<output>
<?php 
    for ($i = 0; $i < $images; $i++)
    {
        $image = $files[$i];
        echo '<div id="img' . ($i+1) . '" class="photo" style=""><img src="' . $image . '" /></div>';
    }
?>
</output>

     echo '<form action="'. $_SERVER["PHP_SELF"] .'" method="post">';
     echo 'Solution:<br>';
     echo '<textarea name="bericht"></textarea><br>';
     echo '</form>';

echo '<form action="'. $_SERVER["PHP_SELF"] .'" method="post">';
     echo 'Solution:<br>';
     echo '<textarea name="bericht"></textarea><br>';
     echo '</form>';