如何卸载tabcontainer中的页面？
<tabcontainer id= "tab1 " style= "Z-INDEX: 100; LEFT: 480px; WIDTH: 280px; POSITION: absolute; TOP: 448px; HEIGHT: 181px " onchange= "tab_Change() " tab_index= "1 ">
<tabbutton width= "240px " tab_text= "Button1 " tab_id= "1 "> </tabbutton>
<tabbutton width= "240px " tab_text= "Button2 " tab_id= "2 "> </tabbutton>
<tabbutton width= "240px " tab_text= "Button3 " tab_id= "3 "> </tabbutton>
</tabcontainer>

function tab_sales_award()
{
tab1.setpage(tab1.tab_index==1? "testpage1.aspx ":(tab1.tab_index==2 ? "testpage2.aspx " : "testpage3.aspx? "));
}

请问,怎样可以将tabcontainer中加载的页面卸载？

------解决方案--------------------
tab1.setpage() 从何而来？？？

相应的方法要拿出来啊。