.widget_tableDiv {
        position: relative;     /* to capture the absolutely positioned table header */
        padding-top: 45px;      /* space for the column heads */
        width: auto;
        margin: 0 auto;
}
/* this enables the table to scroll without scrolling the page */
.innerframe {
        overflow: auto;
        width: auto;
        height: 300px;          /* height is required */
}
/* position the row of column heads above the table */
.widget_tableDiv thead tr {
        position: absolute;     /* throws the header out of the table */
        top: 0px;
        left: 0px;
        height: 44px;
}
.widget_tableDiv tfoot tr {
        position: absolute;     /* throws the footer out of the table */
        top: 345px;
        left: 0px;
}

table {
        /*border-right: solid 1px slategray;*/
        width:auto;
}

<div class="widget_tableDiv" id="widget_tableDiv">

    <!--<div id="divTable<%=tb.getRandomId()%>">-->
    <div id="innerframe" class="XYZ" >
    <table id="myTable<%=tb.getRandomId()%>" <%if(!IE) out.print("class=\"scrollable\"");%> >
        <thead>
            <tr>
                <%

            int y=0;
            for (int i = 0; i < tb.getHeaderSize(); i++) {
                //if(tb.getHeader().get(i).getValue("IO").equalsIgnoreCase("H")) continue;
                %>
                <td><%=tb.getHeaderDesc(i).replaceAll("\\|", "<br>")%><br>
                    <select id="idFiltro<%=y%>"  onchange="javascript:executeFilter(this.id,true)" />                </td>
                <%y++;}%>
            </tr>
        </thead>
                <tfoot id="footerid">
            <tr id="totidrow">
                <%
            y=0;
            for (int i = 0; i < tb.getHeaderSize(); i++) {
                //if(tb.getHeader().get(i).getValue("IO").equalsIgnoreCase("H")) continue;
                %>
                <td id="totid<%=y%>"></td>
                <%y++;}%>
            </tr>
        </tfoot>
        <tbody>
            <% for (int i = 0; i < tb.getNumbersOfRows(); i++) {%>
            <tr id="row<%=i%>" <% if(target != null && !target.equalsIgnoreCase("")){

                %>