Enter Text In Into Two TextBoxes At the Same Time

In Coding Page

function makeSame()
{
document.getElementById('T2').value= document.getElementById('T1').value;
}


Here makesame() function is called with TextBox1 onkeyup event

<asp:textbox id="T1" runat="server" style="z-index: 100; left: 210px; position: absolute; top: 130px" onkeyup="makeSameundefined);"></asp:TextBox>
<asp:textbox id="T2" runat="server" style="z-index: 101; left: 209px; position: absolute; top: 183px"></asp:TextBox>