I am sure this is possible but I am at my wits end with trying to figure this out.  Is there a way to populate an asp.net textbox from a javascript variable.  What I have is a list of time that I am using as a link in a gridview.  When I click on the gridview link, I am having it show a hidden div layer and from there passing a variable TeeTime to it.  My problem is I can use a simple html text box and it show correctly in there but is there a way to make it show up in a server side text box.  <asp:textbox runat="server"......

<script language="JavaScript1.1">
<!--
var TempTeeTime;

function ShowHide0(TeeTime){
    if(document.getElementById("div0").style.display=="block")
	    document.getElementById("div0").style.display="none";
    else
	    document.getElementById("div0").style.display="block";	
	    TempTeeTime = escape(TeeTime)
	    document.getElementById("testtextbox").value = TempTeeTime;
	    
    }
//-->
</script>

ASP.NET CODE

<div id="div0" class="HiddenDiv">
        <table cellpadding="2" style="width: 100%">
            <tr>
                <td colspan="5">
                    <h4><asp:textbox runat="server" id="txtShowTeeTime"/></h4>
                </td>
            </tr>
        </table>
</div>

ASP.NET Server Controls get their ID re-written when the page is rendered. You have to use the ClientID attribute of the control to gain access to it from client-side.

So try the following:

document.getElementById("<%=txtShowTeeTime.ClientID%>").value = TempTeeTime;