$("#txt1").select();

$("input[type=text]").focus(function() {
    $(this).select();
});

//code....

$("#txt1").focus();

//some code here to deselect the contents of this textbox

$("input").focus(function(){
  this.selectionStart = this.selectionEnd = -1;
});

$("input[type=text]").focus(function() {
     if($(this).skipFocus) return;
     $(this).select();
 });

 //code....

 $("#txt1").skipFocus = true;
 $("#txt1").focus();

$(your_input_selector).attr('disabled', 'disabled');
   $(your_input_selector).removeAttr('disabled');

$(document).ready(function(){
    $('#txt1').focus(function(){
      setTimeout(function(){
        // set selection start, end to 0
        $('#txt1').attr('selectionStart',0);
        $('#txt1').attr('selectionEnd',0);
      },50);  // call the function after 50ms
    });
  });