var whitespace = " \t\n\r";

function isEmpty(s) {
    return ((s == null) || (s.length == 0))
}

function isWhitespace (s) {
    var i;

    // Is s empty?
    if (isEmpty(s)) return true;

    // Search through string's characters one by one
    // until we find a non-whitespace character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++) {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (whitespace.indexOf(c) != -1) return true;
    }

    // All characters are whitespace.
    return false;
}


function radio_button_checker(radiopath)
{
// set var radio_choice to false
var radio_choice = false;

// Loop from zero to the one minus the number of radio button selections
for (counter = 0; counter < radiopath.length; counter++)
{
// If a radio button has been selected it will return true
// (If not it will return false)
if (radiopath[counter].checked)
radio_choice = true; 
}

if (!radio_choice)
{
// If there were no selections made display an alert box 

return (false);
}
return (true);
}



function isEmail (s) {   

	if (isEmpty(s)) 
	    return false;
	
    //if (isEmail.arguments.length == 1) return defaultEmptyOK;
    //else return (isEmail.arguments[1] == true);
   
    // is s whitespace?
    if (isWhitespace(s)) {
      return false;
    }
    
    // there must be >= 1 character before @, so we
    // start looking at character position 1 
    // (i.e. second character)
    var i = 1;
 
    var sLength = s.length;
   

    // look for @
    while ((i < sLength) && (s.charAt(i) != "@"))
    { i++
    }

    if ((i >= sLength) || (s.charAt(i) != "@")) return false;
    else i += 2;

    // look for .
    while ((i < sLength) && (s.charAt(i) != "."))
    { i++
   }

    // there must be at least one character after the .
    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
    else return true;
}