function clearOnInitialFocus ( fieldName ) {
var clearedOnce = false;
document.getElementById( fieldName ).onfocus = (function () {
if (clearedOnce == false) {
this.value = '';
clearedOnce = true;
}
})
}
window.onload = function() { clearOnInitialFocus('keywords');}
//Purpose: To clear searchbox
//Usage: <input name="keywords" id="keywords" value="default message">