How to pass asp.net textbox control to JavaScript function

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ASP.NET

Javascript

Hello Friends,

I have one javascript file called timepicker.js, which is used for Time Pick and which includes one function called "selectTime". This function have two parameters ctrl1 and ctrl2, this looks like follows

selectTime(ctrl1,ctrl2){}

From aspx page i am passing 2 values of image and textbox. When I am selected time from popup its selecting correct time and showing into textbox but it is giving "Object Required error" on the page. I am passing the textbox value as document.getElementById('<%=txtTime.ClientId%>'). Code is working fine but I want to remove this object required error. The code is looks like follows: -

<script src="timepicker.js" type="text/javascript"></script>

<asp:textbox id="txtTime" runat="server" cssclass="TextBox" value="12:00 pm" width="88px" xmlns:asp="#unknown"></asp:textbox>


<img src="timepicker.gif" id="pick" alt="Pick a Time!" onclick="selectTime(this,document.getElementById('&lt;%=txtTime.ClientId%&gt;'))" />

Is there any other way to pass textbox to function without error?
If I use html input type then its working without any error, but I dont want to use html control. Please it'll be very helpful for me if anyone help me.. Thank you in advance.