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.style.border = '1px red solid';
		formField.focus();
		result = false;
	}else{
		formField.style.border = '';
	}
	
	return result;
}

function allDigits(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;
}

function validEmail(formField,fieldLabel,required)
{
	var result = true;
	
	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	{
		alert("Please enter a complete email address in the form: yourname@yourdomain.com");
		formField.style.border = '1px red solid';
		formField.focus();
		result = false;
	}else{
		formField.style.border = '';
	}
   
  return result;

}

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

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


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 = elems[1];
 			var year = parseInt(elems[2],10);
			result = allDigits(elems[0]) && (day > 0) && (day < 32) && (elems[1].length == 3) && allDigits(elems[2]) && (elems[2].length == 4) && (year > 2003);
 		}
 		
  		if (!result)
 		{
 			alert('Please enter a date in the format DD-MMM-YYYY for the "' + fieldLabel +'" field.');
			formField.focus();		
		}
	} 
	
	return result;
}

function winpopup(pageurl,sizex,sizey) {
	var xMax = screen.width, yMax = screen.height;
	// can set xy coordinates based on screen res and popup size
	Xpos = (xMax - sizex)/2;
	Ypos = (yMax - sizey)/2;
	// set popup window parameters
	var param = 'width='+sizex+',height='+sizey+',status=no,resizable=yes,scrollbars=yes,screenX='+Xpos+',screenY='+Ypos;
	// open window
	var popwin = window.open(pageurl,'popwin',param);
	// focus on popup window
	popwin.focus();
}

function iwinpopup(pageurl,sizex,sizey) {
	var xMax = screen.width, yMax = screen.height;
	// can set xy coordinates based on screen res and popup size
	Xpos = (xMax - sizex)/2;
	Ypos = (yMax - sizey)/2;
	// set popup window parameters
	var param = 'width='+sizex+',height='+sizey+',status=no,resizable=yes,scrollbars=yes,screenX='+Xpos+',screenY='+Ypos;
	// open window
	var ipopwin = window.open(pageurl,'ipopwin',param);
	// focus on popup window
	ipopwin.focus();
}