ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false

function getSelectedRadio(buttonGroup) {
   // returns the array number of the selected radio button or -1 if no button is selected
   if (buttonGroup[0]) { // if the button group is an array (one button is not an array)
      for (var i=0; i<buttonGroup.length; i++) {
         if (buttonGroup[i].checked) {
            return i
         }
      }
   } else {
      if (buttonGroup.checked) { return 0; } // if the one button is checked, return zero
   }
   // if we get to this point, no radio button is selected
   return -1;
} // Ends the "getSelectedRadio" function

function getSelectedRadioValue(buttonGroup) {
   // returns the value of the selected radio button or "" if no button is selected
   var i = getSelectedRadio(buttonGroup);
   if (i == -1) {
      return "";
   } else {
      if (buttonGroup[i]) { // Make sure the button group is an array (not just one button)
         return buttonGroup[i].value;
      } else { // The button group is just the one button, and it is checked
         return buttonGroup.value;
      }
   }
} // Ends the "getSelectedRadioValue" function

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

function getSelectedCheckboxValue(buttonGroup) {
   // return an array of values selected in the check box group. if no boxes
   // were checked, returned array will be empty (length will be zero)
   var retArr = new Array(); // set up empty array for the return values
   var selectedItems = getSelectedCheckbox(buttonGroup);
   if (selectedItems.length != 0) { // if there was something selected
      retArr.length = selectedItems.length;
      for (var i=0; i<selectedItems.length; i++) {
         if (buttonGroup[selectedItems[i]]) { // Make sure it's an array
            retArr[i] = buttonGroup[selectedItems[i]].value;
         } else { // It's not an array (there's just one check box and it's selected)
            retArr[i] = buttonGroup.value;// return that value
         }
      }
   }
   return retArr;
} // Ends the "getSelectedCheckBoxValue" function


//Simple Cross-Browser getElement Function
function getElement(psID) {
	if(document.all) {
		return document.all[psID];
	} else {
		return document.getElementById(psID);
	}
}


function getSelectedOption(field)
{
  var index = field.selectedIndex;

  if (index < 0)
  {
	return "";
  }
  else
  {
	  var selectOpt = field.options[index].value;
	  return selectOpt;
  }
}


function isEmailAddr(email)
{
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
  }
  return result;
}

function validRequired(formField,fieldLabel)
{
	var result = true;
	
	if (formField.value == "")
	{
		alert('Please enter a value for the "' + fieldLabel +'" field.');
		formField.focus();
		result = false;
	}
	
	return result;
}

function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function allFloatingDigits(str)
{
	return inValidCharSet(str,"0123456789.");
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}
	
	return result;
}

// Count the existence of charset in a string
function countCharSet(str,charset)
{
	var result = true;
    var count = 0;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0)
		{

		}
		else
		{
		    count++;
		}

	return count;
}

function validEmail(formField,fieldLabel,required)
{
	var result = true;

	if (formField.value.length>0 && ((formField.value.length<3) || !isEmailAddr(formField.value)))
	{
		alert("Please enter a complete email address for the '" + fieldLabel + "' field: yourname@yourdomain.com");
	  result = false;
	}
	else if (required && !validRequired(formField,fieldLabel))
	{
		result = false;
	}

  return result;

}

function validNum(formField,fieldLabel,required)
{
	var result = true;

	if (formField.value.length>0 && !allDigits(formField.value))
	{
		alert('Please enter a number for the "' + fieldLabel +'" field.');
		formField.focus();
		result = false;
	}
	else if (required && !validRequired(formField,fieldLabel))
	{
		result = false;
	}

  return result;
}

function validFloat(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

    if (result)
 	{
 		var num = parseFloat(formField.value);
 		if (isNaN(num) || !allFloatingDigits(formField.value))
 		{
 			alert('Please enter a number or decimals for the "' + fieldLabel +'" field.');
			formField.focus();
			result = false;
		}
		else if (countCharSet(formField.value,".")>1)
		{
		    alert('Please enter a number or decimals for the "' + fieldLabel +'" field.');
			formField.focus();
			result = false;
		}
	}

    return result;
}

function validInt(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var num = parseInt(formField.value,10);
 		if (isNaN(num) || !allDigits(formField.value))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();
			result = false;
		}
	}
	return result;
}


function validMinLength(formField,fieldLabel,len)
{
	if (formField.value.length<len)
	{
		alert('Please enter at least ' + len + ' character for the "' + fieldLabel +'" field.');
		formField.focus();		
		return false;
	}
	return true;
}

function validMaxLength(formField,fieldLabel,len)
{
	if (formField.value.length>len)
	{
		alert('Please enter at most ' + len + ' character for the "' + fieldLabel +'" field.');
		formField.focus();		
		return false;
	}
	return true;
}


function validDate(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var elems = formField.value.split("/");
 		
 		result = (elems.length == 3); // should be three components
 		
 		if (result)
 		{
 			var day = parseInt(elems[0],10);
  	  var month = parseInt(elems[1],10);
 			var year = parseInt(elems[2],10);
			result = allDigits(elems[0]) && (month > 0) && (month < 13) &&
					 allDigits(elems[1]) && (day > 0) && (day < 32) &&
					 allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
 		}
 		
  		if (!result)
 		{
 			alert('Please enter a date in the format DD/MM/YYYY for the "' + fieldLabel +'" field.');
		}
	} 
	
	return result;
}

function validRadioClicked(buttonGroup,buttonLabel) {
   // returns the array number of the selected radio button or -1 if no button is selected
   if (buttonGroup[0]) { // if the button group is an array (one button is not an array)
      for (var i=0; i<buttonGroup.length; i++) {
         if (buttonGroup[i].checked) {
            return true
         }
      }
   } else {
      if (buttonGroup.checked) { return true; } // if the one button is checked, return true
   }
   // if we get to this point, no radio button is selected
   alert('Please select an option in the "' + buttonLabel +'" field.');
   return false;
}