一个div层被应用alpha后，里面的文字变全透明了。参照网上说的设置position没有用。谁有办法解决这个透明问题？？
代码如下：
HTML:
<div id= "Main__%WndID%_ " class= "Main ">
<div id= "TopArea__%WndID%_ " class= "TopArea " onmousedown= "ElpisWindow_OnMouseDown( '_%WndID%_ '); " onmouseup= "ElpisWindow_OnMouseUp( '_%WndID%_ '); " onmousemove= "ElpisWindow_OnMouseMove( '_%WndID%_ ') ">
<div id= "LeftTopSite__%WndID%_ " class= "LeftTopSite ">
<div id= "Title__%WndID%_ " class= "Title ";>
<span class= "Title "> <strong> _%WndTitle%_ </strong> </span>
</div>
</div>
<div id= "MiddleTopSite__%WndID%_ " class= "MiddleTopSite ">
</div>
<div id= "RightTopSite__%WndID%_ " class= "RightTopSite ">
</div>
</div>
<div id= "MiddleArea__%WndID%_ " class= "MiddleArea ">
<div id= "LeftVerticalSite__%WndID%_ " class= "LeftVerticalSite ">
</div>