ヘッダ固定でボディだけスクロールさせる

adjust-size.js

$(function(){
    function table_adjust(){
        var width_arr = new Array();
        var tbody_tds = $('#estimateList tbody tr:first-child td');
        var thead_ths = $('#estimateList thead tr:first-child th');
        $.each($(tbody_tds),function(i){
            width_arr.push($(this).width());
        });
        $.each($(thead_ths),function(i){
            $(this).width(width_arr[i]);
        });
    }

    $(document).ready(function(){
        table_adjust();
    });

    $(window).resize(function(){
        table_adjust();
    });
});    

scroll-tbody.css

#list-box{
  height: 380px;
  padding-top: 80px;
	position: relative;
	float: none;
}

.scroll {
	overflow-x: auto;
	overflow-y: auto;
	height: 380px;
}

#list-box thead {
	clear: both;
	float: none;
	position: absolute;
	top: 0px;
	left: 0px;
	height: 80px;

	overflow-x: auto;
	overflow-y: hidden;

}