function setStyle(x) {
  document.getElementById(x).style.background="#FFFFbb"
}

function unsetStyle(x) {
  document.getElementById(x).style.background="#ffffff"
}

// ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

// http://www.w3schools.com/jsref/jsref_onkeypress.asp

function Keyboard(e) {

if(window.event) {    // IE
  keynum = e.keyCode
} else if (e.which) { // Netscape/Firefox/Opera
  keynum = e.which
}

if (keynum > '47' && keynum < '59')  { return true } // numeric key pressed  #  48=0 ... 57=9
if (keynum > '64' && keynum < '91')  { return true } // a-z key pressed      #  64=A ... 90=Z
if (keynum > '96' && keynum < '123') { return true } // a-z key pressed      #  97=a ... 122=z
if (keynum == '8')                   { return true } // DEL,TAB,BACKSPACE key pressed
return false // don't display keypress

}

// ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::