比如原宽160,按某BUTTON后为10

谢谢佛山人，昨天我用差不多的方面解决了！
function louhve_display(tlb_id,arw_id){
    var tlb_id;//表格ID
    var arw_id;//箭头ID
    var on_img="../pic/lt_right_lt.jpg";
    var off_img="../pic/lt_right_rt.jpg";
    
    
        if (tlb_id.style.display == "none") {
         arw_id.src=on_img;
             tlb_id.style.display="";
         arw_id.alt="折叠索引栏";
                 top.rtcover.cols="160,*";
                 }            
    else{//否则
        tlb_id.style.display="none";
        arw_id.src=off_img;
        arw_id.alt="展开索引栏";
        top.rtcover.cols="10,*";
        }
}

//-->

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此为框架页的
NAME 与 ID 效果一样？？