Using Javascript creating control without postback

Friend Name	Email Id	Delete

/////////////////////////////////Javascript///////////////////////////
///////////////////This is for adding row/////////////////////////////
var rowcount=1;
var checkcount=1;
function fnAddRow()
{
rowcount++;
// var check=validate(); //this is for my page validation
if(check!=false)
{
var objTbl = document.getElementById("Tellafriend1");
var objTbody = objTbl.getElementsByTagName("tbody")[0];
var row = document.createElement("tr");
//txtfriendname///
var friendnameval=document.createElement("td");
var friendnameDel = document.createElement("INPUT")
friendnameDel.setAttribute("type","text");
friendnameDel.setAttribute("name","txtfriendname"+rowcount);
friendnameDel.setAttribute("id","txtfriendname"+rowcount);
friendnameval.appendChild(friendnameDel)
row.appendChild(friendnameval);
//txtfriendname///
//txtfriendemail///
var friendemailval=document.createElement("td");
var friendemailDel = document.createElement("INPUT")
friendemailDel.setAttribute("type","text");
friendemailDel.setAttribute("name","txtfriendemail"+rowcount);
friendemailDel.setAttribute("id","txtfriendemail"+rowcount);
friendemailval.appendChild(friendemailDel)
row.appendChild(friendemailval);
//txtfriendemail///

//checkbox///
var checkval=document.createElement("td");
var ChkDel = document.createElement("INPUT")
ChkDel.setAttribute("type","checkbox");
ChkDel.setAttribute("name","chkDelete"+rowcount);
ChkDel.setAttribute("id","chkDelete"+rowcount);
checkval.appendChild(ChkDel)
row.appendChild(checkval);
//End check box checkbox///
objTbody.appendChild(row);
}
else
{
return false;
}
}
///////////////////End adding row/////////////////////////////

Note:For deleting i am using checkbox...................
///////////////Deleting Row//////////////////////////////////

function fnDelRow()
{
var ChkOption = ""
for(var i=2;i<=rowcount;i++)
{
var ChkCtrl = document.getElementById("chkDelete"+i)

if(ChkCtrl == '[object]')
{
if(ChkCtrl.checked)
{
ChkOption = "1"
delRow(ChkCtrl)
checkcount++;
}
}
}
if(ChkOption == "" && rowcount!=1)
{
alert("Select any one option to delete")
return false;
}
}
function delRow(button)
{
var row = button.parentNode.parentNode;
var tbody = document.getElementById('Tellafriend1').getElementsByTagName('tbody')[0];
tbody.removeChild(row);
}

/////////////////////////////End Deleting row////////////////////////////////