Forms Data Controls :: Highlighting Textboxes Value In A Repeater?

I'm trying to highlight the contents of a texbox on focus. My textboxes reside in a repeater. Here's is what I tried to do:

javascript:

function SetSelected(strTextBox)
{
var txtTextbox = document.getElementById('<%= strTextBox.ClientID %>');
txtTextbox.select();
}

in repeater item bound event:

txtLower.Attributes.Add("onfocus", "SetSelected('txtLower');");
txtUpper.Attributes.Add("onfocus", "SetSelected('txtUpper');");

Obviously this would'nt work because the textbox name would be different in each repeater row. Does anyone know how I can set a js attribute to each textbox in each repeater row??