First of all
<title></title>
<script type = "text/javascript">
<html xmlns="http://www.w3.org/1999/xhtml">
the above code is not used in child page. these tags are already used in masterpage.hence not to be used now.
check with below code of javascript:
<script type = "text/javascript" language="javascript" >
//This is the javascript function which will calulate the total
function calculate() {
var sub1 = document.getElementById('<%=txtOSIInterstFromBank.ClientID%>').value; //
alert(sub1);
}
</script>
use this, because in contentplace holder the id of the control change.for better understanding, go to view source of browser, then see the id of your controls.
make it solution if you got your answer and dont forget to rate..
Thanks
Ashish