Re:JavaScript: I have 4 textboxes in that 3 are we can enter the integer Values 4 th textbox is read only.

function Matchvalues()
{
  var value1 = document.getElementById('TextBox1').value;
  var value2 = parseInt(document.getElementById('TextBox2').value) +
               parseInt(document.getElementById('TextBox3').value) +
               parseInt(document.getElementById('TextBox4').value);

  if (value1 != value2) {
    alert('value in 1st TextBox and sum of Textbox2,Textbox3,Textbox4 are not matched');
    return false;
  }
  else {
    alert('value in 1st TextBox and sum of Textbox2,Textbox3,Textbox4 are matched');
    return true;
  }

}