// isEmail (STRING s)
// 
// Email address must be of form a@b.c ... in other words:
// * there must be at least one character before the @
// * there must be at least one character before and after the .
// * the characters @ and . are both required
//

function isEmail (s)
{
   if (isEmpty(s)) return false;
   
    // 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;
}

// Check whether string s is empty.
function isEmpty(s)
{   
	return ((s == null) || (s.length == 0));
}


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

// Returns true if string s is empty or 
// whitespace characters only.
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 false;
    }

    // All characters are whitespace.
    return true;
}

var numeric = "1234567890-."
function isNumeric (s)
{
    for (i = 0; i < s.length; i++)
    {   
		// Check that current character is numeric.
		var c = s.charAt(i);
	
		if (numeric.indexOf(c) == -1) return false;
    }
	return true;
}

function cal1DateBeforeCal2Date(calendarOneField, calendarTwoField)
{
	var publishDateValue=calendarOneField.value;
	//alert('publishDate:'+publishDateValue);
	publishArray=publishDateValue.split("/");
	//alert(publishArray[0] +'/'+ publishArray[1] +'/'+ publishArray[2]);
	var publishDate=new Date();
	publishDate.setYear(publishArray[2]);
	publishDate.setMonth(publishArray[1]-1);
	publishDate.setDate(publishArray[0]);
	//alert(publishDate);
	
	var expireDateValue=calendarTwoField.value;	
	expireArray=expireDateValue.split("/");
	var expireDate=new Date();
	expireDate.setYear(expireArray[2]);
	expireDate.setMonth(expireArray[1]-1);
	expireDate.setDate(expireArray[0]);
	//alert(expireDate);
	
	if(expireDate.getTime() < publishDate.getTime())
	{
		return false;	
	}
	else
	{
		return true;
	}
}	


function getSelectedCheckbox(buttonGroup) {
   // Go through all the check boxes. return an array of all the ones
   // that are selected (their position numbers). if no boxes were checked,
   // returned array will be empty (length will be zero)
   var retArr = new Array();
   var lastElement = 0;
   if (buttonGroup[0]) { // if the button group is an array (one check box is not an array)
      for (var i=0; i<buttonGroup.length; i++) {
         if (buttonGroup[i].checked) {
            retArr.length = lastElement;
            retArr[lastElement] = i;
            lastElement++;
         }
      }
   } else { // There is only one check box (it's not an array)
      if (buttonGroup.checked) { // if the one check box is checked
         retArr.length = lastElement;
         retArr[lastElement] = 0; // return zero as the only array value
      }
   }
   return retArr;
} // Ends the "getSelectedCheckbox" function