// Trim whitespace from a string
function trim(s) {
  while (s.substring(0,1) == ' ') {
    s = s.substring(1,s.length);
  }
  while (s.substring(s.length-1,s.length) == ' ') {
    s = s.substring(0,s.length-1);
  }
  return s;
}

function btnsubmit_onclick ()   
{
    if (document.getElementById ("keyword").value == "keyword" || trim (document.getElementById ("keyword").value) == "")
    {
        alert ("Please enter a valid keyword");
        document.getElementById ("keyword").value = "";
        document.getElementById ("keyword").focus ();
        return false;
    }
    
    return true;
}

function txtkeyword_onclick ()
{
    if (document.getElementById ("keyword").value == "keyword")
    {
        document.getElementById ("keyword").value = "";
    }
}