Not able to make a scrollable, fixed header dataTables version 1.9.4 work with IE 8

Hi, Here is my code..
var oTable = $('#dashboard_table').dataTable({
"sPaginationType": "full_numbers" ,
"bPaginate": true,
"bFilter": true,
"sScrollY": "354px;",
"sScrollX": "600px;",
"sScrollXInner": "150%",
"sScrollYInner": "250%",
"bScrollCollapse": true
});
It is working fine with all the browsers and also with IE6. But when i use IE 8, i get an error at the line no. 3123, with invalid argument error.
nScrollHead.style.width = _fnStringToCss( oSettings.oScroll.sX );

Any help would be appreciated.
Regards,
Veena