<div id="TabContainer1" class="mycss" style="visibility:hidden;">
<div id="TabContainer1_header">
<span id="TabContainer1_tab1_tab">
<span class="ajax__tab_outer">
<span class="ajax__tab_inner">
<span class="ajax__tab_tab" id="__tab_TabContainer1_tab1">Tab1</span>
</span>
</span>
</span>
<span id="TabContainer1_tab2_tab">
<span class="ajax__tab_outer">
<span class="ajax__tab_inner">
<span class="ajax__tab_tab" id="__tab_TabContainer1_tab2">Tab2</span>
</span>
</span>
</span>
</div>
<div id="TabContainer1_body" style="height:100px;">
<div id="TabContainer1_tab1" class="ajax__tab_panel">Tab1のコンテンツ</div>
<div id="TabContainer1_tab2" class="ajax__tab_panel" style="display:none;visibility:hidden;">Tab2のコンテンツ</div>
</div>