1.Assuming ‘Search’ is the id given for the Textbox.
2.setFocus() function called on BODY load.
3.The function will position the cursor at the end of the Textbox value
(if any value Present it will point at the end of the value)

function setFocus()
{
var field = document.form.Search;
field.focus();
field.value = field.value;
field.focus();
}