Javascript validation issue with update panel

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ASP.NET

Javascript

UpdatePanel

Hello all,

I want to call my javascript function from my button inside update panel
I have written above code but its not calling that function, as it is inside update panel.

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
   <ContentTemplate>
     <fieldset>
          <asp:Button ID="btnSubmit" runat="server" CssClass="btn"  OnClientClick ="return validate()" onclick="btnSubmit_Click" Text="Submit" Width="109px"/>
           <br />
       <asp:Label ID="lblMessage" runat="server" Font-Bold="True" ForeColor="#FF3300">                      </asp:Label>
          </fieldset>
       </ContentTemplate>
</asp:UpdatePanel>

Javascript Function

<script language="javascript" type="text/javascript">
function validate() {
var summary = "";
summary += isvalidProposerName();
summary += isvalidProposlAmount();
summary += isvalidDocRcvdDate();
summary += isvalidDocRcvdTime();
summary += isvalidIntermediaryCode();
if (summary != "") {
alert(summary);
return false;
}
else {
return true;
}

}
function isvalidProposerName() {
var uid;
var temp = document.getElementById("txtProposerName").value;
uid = temp.value;
if (uid == "") {
return ("Please Enter Proposer Name" + "\n");
}
else {
return "";
}
}
function isvalidProposlAmount() {
var uid;
var temp =document.getElementById("txtProposalAmount").value;
uid = temp.value;
if (uid == "") {
return ("Please Enter Proposal Amount" + "\n");
}
else {
return "";
}
}
function isvalidDocRcvdDate() {
var uid;
var temp =document.getElementById("txtDocRcvdDate").value;
uid = temp.value;
if (uid == "") {
return ("Please Enter Doc Rcvd Date" + "\n");
}
else {
return "";
}
}
function isvalidDocRcvdTime() {
var uid;
var temp =document.getElementById("txtDocRcvdTime").value;
uid = temp.value;
if (uid == "") {
return ("Please Enter Doc Rcvd Time" + "\n");
}
else {
return "";
}
}
function isvalidIntermediaryCode() {
var uid;
var temp =document.getElementById("txtIntermediaryCode").value;
uid = temp.value;
if (uid == "") {
return ("Please Enter Intermediary Code" + "\n");
}
else {
return "";
}
}
</script>