テーブルタグに設定するだけでは十分ではありませんか？これは静的です。動的に設定したい場合は、
function com_onresize（）{var contentsheight = document.body.clientheight; var buttonsheight = document.getElementbyId（ "buttons"）.offseeth; var head1height = document.getElementbyid（ "head1"）.offseetheigh; document.getElementById（ "tablecontainer1"）.style.height; var t2 = document.getElementbyid（ "tablecontainer2"）.style.height; // alert（document.getelementbyid（ "tablecontainer1"）.style.height -buttonsheight -buttonsheight -buttonsheight -buttonsheigh 13; if（h <110）{return;} document.getElementById（ "tablecontainer1"）.style.height = h/2 + 'px'; document.getelementbyid（ "tablecontainer2"）.style.height = h/2 + 'px';} com_sbs_pageize（） var availableheight = window.screen.availheight; // alert（document.getElementById（ "tablecontainer1"）.children [0] .rows.length）; var index = document.getElementById（ "tablecontainer1"） var mainh = bottonsheight + head1height + head2height + 13; // 20：スクロール35：タイトル25：タイトル25：TR：（（abaveheight -mainh）<（20 + 35 + 25*index）*2）{index = index -1;} var tableheight = 20 + 35 + 25*index; document.getElementById（ "tablecontainer1"）.style.height = tableheight + 'px'; document.getElementById（ "tablecontainer2"）.style.height = tableheight + 'px'; window.resizeto（document.body.offsetwidth、mainh + tableheight*2）;}