向一个table中插入tr

var table = document.getElementById("addtable");
var row = table.insertRow();

var tmpnum = numb;

row.id = tmpnum;
numb++;
  //多选框
var cell=document.createElement ("td"); 
cell.className = 'ItemBody'; 
//cell.style.display="none";
cell.setAttribute('align','center');
var chec = "<INPUT type=checkbox name=checkbo value="+tmpnum+" id="+idmamount+" />"
cell.innerHTML=chec;
row.appendChild (cell);

//币种
var cell=document.createElement ("td"); 
cell.className = 'ItemBody'; 
cell.setAttribute('align','center'); 
cell.appendChild(document.createTextNode ("人民币"));
//插入业务类型的input
var inp1 = document.createElement ("input")
inp1.type="hidden";
inp1.name="ncredittype";
inp1.value=frm.nawardcredittype.value;
//inp1.name="nawardcredittype";

cell.appendChild(inp1); 
row.appendChild(cell);