//form validation. Enter the following text into the HTML form tag:
//  onSubmit="return  canSubmit(this)"

// function to trim string values
function TrimString(sInString) {
  sInString = sInString.replace( /^\s+/g, "" );// strip leading
  return sInString.replace( /\s+$/g, "" );// strip trailing
}
	
function filled(field) {
  if (field.value == "" || field.value == null) {
	 return false;
  } else {
	 return true;
  }
}

function emailmatch(field1,field2) {
  if (field1.value == field2.value) {
		return true;
	} else {
		return false;
	}
 }
 
 
function confirmmatch(field1,field2) {
  if (field1.value == field2.value) {
		return true;
	} else {
		return false;
	}
 }
 


function isValidEmail(field) {
	var emailFilter=/^.+@.+\..{2,4}$/;
	if (!(emailFilter.test(field.value))) { 
	   return false;
	} else {
		return true;
	}
}

function zero(field) {
	if (field.value == 0 || field.value == null) {
		return true;
	} else {
		return false;
	}
}

// BEGIN Checkbox and radio button validation

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

//End functions needed for validation