Наверно так
<html lang="ru">
<head>
<link rel="stylesheet" href="http://www.jacklmoore.com/colorbox/example1/colorbox.css" />
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript" src="http://www.jacklmoore.com/colorbox/jquery.colorbox.js"></script>
<script>function hideShow(el){$(el).toggleClass('show').siblings('div.hideCont_v1').slideToggle('normal');return false;};
</script>
<script>
$(document).ready(function(){
//Examples of how to assign the ColorBox event to elements
$(".group1").colorbox({rel:'group1', inline:true});
$(".group2").colorbox({rel:'group2', transition:"fade"});
$(".group3").colorbox({rel:'group3', transition:"none", width:"75%", height:"75%"});
$(".group4").colorbox({rel:'group4', slideshow:true});
$(".ajax").colorbox();
$(".youtube").colorbox({iframe:true, innerWidth:425, innerHeight:344});
$(".iframe").colorbox({iframe:true, width:"80%", height:"80%"});
$(".inline").colorbox({inline:true, width:"50%"});
$(".callbacks").colorbox({
onOpen:function(){ alert('onOpen: colorbox is about to open'); },
onLoad:function(){ alert('onLoad: colorbox has started to load the targeted content'); },
onComplete:function(){ alert('onComplete: colorbox has displayed the loaded content'); },
onCleanup:function(){ alert('onCleanup: colorbox has begun the close process'); },
onClosed:function(){ alert('onClosed: colorbox has completely closed'); }
});
});
</script>
</head>
<body>
<body>
<table id="myTable">
<tr>
<td>
<a class="group1" href="#1">
<img src="http://javascript.ru/forum/images/ca_serenity/misc/logo.gif">
</a>
<div style="display: none">
<div id="1" style="width:336px; height:220px">
<img src="http://javascript.ru/forum/images/ca_serenity/misc/logo.gif">
<a href="javascript://" title="Показать\Скрыть блок" onclick="$(this).toggleClass('show');$(this).next().slideToggle('normal');return false;">Показать</a>
<div class="Some_text" style="display: none;">
<h3>Основное содержимое скрытого блока</h3>
<p>Some text 1.</p>
</div>
</div>
</div>
</td>
<td>
<a class="group1" href="#2">
<img src="http://javascript.ru/forum/images/ca_serenity/misc/logo.gif">
</a>
<div style="display: none">
<div id="2" style="width:336px; height:220px">
<img src="http://javascript.ru/forum/images/ca_serenity/misc/logo.gif">
<a href="javascript://" title="Показать\Скрыть блок" onclick="$(this).toggleClass('show');$(this).next().slideToggle('normal');return false;">Показать</a>
<div class="Some_text" style="display: none;">
<h3>Основное содержимое скрытого блока</h3>
<p>Some text 2.</p>
</div>
</div>
</div>
</td>
</tr>
</table>
</body>
</html>