use onkeyup function in Repeater

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Javascript

repeater

i am use onkeyup function in repeater i tried lot but could not work it out i used

<asp:Repeater ID="RepItem" runat="server" >
<asp:TextBox ID="TextBox1" runat="server" OnKeyUp="GoToNextTextBox(this, event); return false;">



<asp:Label ID="lblGross" runat="server" Text='<%# Eval("appGrossWt")%>'>

<asp:TextBox ID="txtUsed" onkeyup="sumCalc();" runat="server">
<asp:TextBox ID="TxtReturn" onkeyup="sumCalc();" runat="server">
<asp:TextBox ID="Txtbal" onkeyup="sumCalc();" runat="server">

<script language="javascript" type="text/javascript">

function sumCalc() {
var _lblGross = document.getElementsByTagName("input")[0];
var _txtUsed = document.getElementById('<%= txtUsed.ClientID %>');
var _TxtReturn = document.getElementById('<%= txtReturn.ClientID %>');
var _Txtbal = document.getElementById('<%= txtbal.ClientID %>');
var t1 = 0, t2 = 0, t3 = 0;

if (_txtUsed.value != "") t1 = _TextBox1.value;
if (_TxtReturn.value != "") t2 = _TextBox2.value;
if (_lblGross.toString != "") t3 = _lblGross.toString;


_Txtbal.value = parseInt(t3) - parseInt(t1) - parseInt(t2);

}
</script>



i am trying to as i enter any number in text box cal should be make in balance with in second as per onkeyup function