Hi,
You mean to say when textbox1 loose focus, value should be bind to textbox2. Right?
If yes then,
<script>
$('#<%= textbox1.ClientID %>').blur(function(){
$('#<%= textbox2.ClientID %>').val($('#<%= textbox1.ClientID %>').val());
});
</script>
add onBlur='copyvalue(this)' in text box
<script>
function copyvalue(e)
{
document.getElementByID('#<%= textbox2.ClientID %>').value = document.getElementByID('#<%= textbox1.ClientID %>').value;
}
</script>
This should work in all browser.