I am not very sure that it is a problem related to mojoportal or not.

I write a css file in my ascx file to fix the header of a grid for IE, the css code is below.

<Style type="text/css">

 .GVFixedHeader { font-weight:bold; background-color: White; position:relative;
                 top:expression(this.offsetParent.scrollTop);}

</Style>

It work for the main site (siteID = 1), but when I move my module to the sub-sites, the header doesn't fix.

I have checked for the feature setting, it doesn't related to the culture or the data input, it only doesn't work in the sub-sites.

What is the possible reason about this problem?

I know it may be not a mojoportal problem but my code, but I am quite strange that why it only work for the main site.

I have checked the system log but nothing about this is logged.

Thanks a lot for help.