一个困难的问题---------------如何进行表格的动态增加?????

var theRowOfTheDynamicTable=null;//用于存放表格要添加的行的样式。function add_row(the_table){ 
if(the_table==null)
return;

var i=0;
var the_row,the_cell;
var row_index=-1;
if(theRowOfTheDynamicTable==null){
theRowOfTheDynamicTable=new Array();
var baseTr=the_table.rows[2];
for(i=0;i<baseTr.cells.length;i++){
the_cell=baseTr.cells[i];
theRowOfTheDynamicTable[i]=the_cell.innerHTML;
}
}
row_index=the_table.rows.length;
var newrow=the_table.insertRow(row_index);
for(i=0;i<theRowOfTheDynamicTable.length;i++){
the_cell=newrow.insertCell(i);
the_cell.align="center";
the_cell.innerHTML=theRowOfTheDynamicTable[i];
}
}function get_Element(the_ele,the_tag){
the_tag = the_tag.toLowerCase();
if(the_ele.tagName.toLowerCase()==the_tag)
return the_ele;
while(the_ele=the_ele.offsetParent){
if(the_ele.tagName.toLowerCase()==the_tag)
return the_ele;
}
return(null);
}function del_row(the_table){ 
var the_cell,the_row;
var i=0;
    the_cell=get_Element(event.srcElement,"td");
if(the_cell==null) return; the_row=the_cell.parentElement.rowIndex;
the_table.deleteRow(the_row);
}function up_row(the_table){ 
var the_cell,cur_row,up_row;
var i=0;
the_cell=get_Element(event.srcElement,"td");
if(the_cell==null) return;
if(the_table.rows.length<=1) return;

cur_row=the_cell.parentElement;
row_index=cur_row.rowIndex;
if(row_index<=0) return;
up_row=the_table.insertRow(row_index-1);

for(i=0;i<cur_row.cells.length;i++){
the_cell=up_row.insertCell(i);
the_cell.align="center";
the_cell.innerHTML=cur_row.cells[i].innerHTML;
}
the_table.deleteRow(row_index+1);
}function down_row(the_table){ 
var the_cell,cur_row,down_row;
  var i=0;
    the_cell=get_Element(event.srcElement,"td");
if(the_cell==null) return;

if(the_table.rows.length<=1) return;

cur_row=the_cell.parentElement;
row_index=cur_row.rowIndex;
if(row_index>=the_table.rows.length-1) return;

down_row=the_table.insertRow(row_index+2);

for(i=0;i<cur_row.cells.length;i++){
the_cell=down_row.insertCell(i);
the_cell.align="center";
the_cell.innerHTML=cur_row.cells[i].innerHTML;
}
the_table.deleteRow(row_index);
}function insert_row(the_table){ 
var the_cell,the_row,temp,row_index,newrow;
  var i=0;
    the_cell=get_Element(event.srcElement,"td");
if(the_cell==null) return;
if(the_table.rows.length<=0) return;
the_row=the_cell.parentElement;
row_index=the_row.rowIndex;
newrow=the_table.insertRow(row_index);
for(i=0;i<the_row.cells.length;i++){
the_cell=newrow.insertCell(i);
the_cell.align="center";
the_cell.innerHTML=the_row.cells[i].innerHTML;
}
}