Это старая ошибка.просто я скрипт меняла по всякому.
Вот новый код
<script language="JavaScript" type="text/javascript">
 // Îáâîðà÷èâàåì ôóíêöèþ toggle â ëîêàëüíîå çàìûêàíèå:
var toggle = function() {
    // Ññûëêà íà òåêóùèé îòêðûòûé div:
    var currentDiv = null;
    // Ôóíêöèÿ äëÿ "ðàñêðûòèÿ" ýëåìåíòà:
    function open(divElement) {
        // Òóò ìîæíî äîáàâèòü ýôôåêò "ïëàâíîãî" îòêðûòèÿ:
        divElement.style.display = "block";
        currentDiv = divElement;
    }
    // Ôóíêöèÿ äëÿ "çàêðûòèÿ" ýëåìåíòà:
    function close(divElement) {
        // Òóò ìîæíî äîáàâèòü ýôôåêò "ïëàâíîãî" çàêðûòèÿ:
        divElement.style.display = "none";
        currentDiv = null;
    }
    // Âîçâðàùàåì ôóíêöèþ, êîòîðàÿ áóäåò âûçûâàòüñÿ ïî toggle()
    return function(divID) {
        // Ïîëó÷àåì ýëåìåíò èç DOM
        var divElement = document.getElementById(divID);
        // Åñëè îòêðûò äðóãîé div, òî çàêðûâàåì è îòêðûâàåì òåêóùèé:
            if(currentDiv != null) {
                close(currentDiv);
                open(divElement);
                }
        // Åñëè òàêîé åñòü:
      else  if (divElement) {
            // Åñëè óæå îòêðûò ýòîò div, òî ïðîñòî çàêðûâàåì.
            if (divElement === currentDiv) {
                close(currentDiv);
            // Åñëè îòêðûò äðóãîé div, òî çàêðûâàåì è îòêðûâàåì òåêóùèé:
            } else if(currentDiv != null) {
                close(currentDiv);
                open(divElement);
            // Èíà÷å - ïðîñòî îòêðûâàåì:
            } else open(divElement);
        }
    }
  // Âûçûâàåì íàøó "îáåðòêó", òåïåðü toggle() âûçûâàåò ôóíêöèþ, îïèñàííóþ ïî "return"
  }();
</script>
if ($i == 1)
	{
    echo '<tr><TD width="39" height="39" nowrap align="center" valign="middle">';
    //echo $day_sel;
    ?>
    
    <A href="javascript://" onClick="toggle('<? echo $day_sel; ?>');return false;" class="c"><div class="data1"><br><? echo $day_now.'.'; echo $month_now; ?></div></a>
<?
    echo '</TD></tr>';
    
    }
    elseif ($i == 2)
   
	{
    echo '<tr><TD width="39" height="39" nowrap align="center" valign="middle">';
    ?>
    <A href="javascript://" onClick="toggle('<? echo $day_sel; ?>');return false;" class="c"><div class="data1"><br><? echo $day_now.'.'; echo $month_now; ?></div></a>
<?
    echo '</TD></tr>';
    }
	 elseif ($i == 3)
	{
    echo '<tr><TD width="39" height="39" nowrap align="center" valign="middle">';
    ?>
    <A href="javascript://" onClick="toggle('<? echo $day_sel?>');return false;" class="c"><div class="data1"><br><? echo $day_now.'.'; echo $month_now; ?></div></a>
<?
    echo '</TD></tr>';
    }
     elseif ($i == 4)
	{
    echo '<tr><TD width="39" height="39" nowrap align="center" valign="middle">';
    ?>
    <A href="javascript://" onClick="toggle('<? echo $day_sel?>');return false;" class="c"><div class="data1"><br><? echo $day_now.'.0'; echo $month_now; ?></div></a>
<?
    echo '</TD></tr>';
    }
     elseif ($i == 5)
	{
    echo '<tr><TD width="39" height="39" nowrap align="center" valign="middle">';
    ?>
    <A href="javascript://" onClick="toggle('<? echo $day_sel?>');return false;" class="c"><div class="data1"><br><? echo $day_now.'.0'; echo $month_now; ?></div></a>
<?
    echo '</TD></tr>';
    }
     elseif ($i == 6)
	{
    echo '<tr><TD width="39" height="39" nowrap align="center" valign="middle">';
    ?>
    <A href="javascript://" onClick="toggle('<? echo $day_sel?>');return false;" class="c"><div class="data1"><br><? echo $day_now.'.0'; echo $month_now; ?></div></a>
<?
    echo '</TD></tr>';
    }
   else
	{
    echo '<tr><TD width="39" height="39" nowrap align="center" valign="middle">';
    //echo $day_sel;
    ?>
    
    <A href="javascript://" onClick="toggle('<? echo $day_sel?>');return false;" class="c"><div class="data1"><br><? echo $day_now.'.0'; echo $month_now; ?></div></a>
<?
    echo '</TD></tr>';
    }