Issue after migrating from .NET 3.5 to 4.5

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ASP.NET

I had a code like this:

<td >                                                                                                                <input type="text" id="TextBox_DOSTo"                                                                                                                runat="server"/>                                                                                                            
                                                                                                            <td>                                                                                                              <img id="img2" src="Images/calender_grey.gif"
onclick="return myaction('TextBox_DOSTo');"  />
                                                                                                            </td>

function myaction(id) {
    var el = document.getElementById(id);
//action
}

myaction is a function in java script. After migrating from 3.5 to 4.5 the server tags are prefixed to the id. So the myaction method fails as it is expecting the text box id as I am passing it.

I have the setting in web.config but it wont work:
<pages controlrenderingcompatibilityversion="3.5" clientidmode="AutoID">.

What can be the best way, so that this function will work. I woluld like to have a global solution for this. Because this kind of code I have in many places.

Thank you
Dhanil

What I have tried:

I tried by changing clientIDMode to static. But i will not work for other places with conflicting ids.