var ns4 = (document.layers);
var ie4 = (document.all && !document.getElementById);
var ie5 = (document.all && document.getElementById);
var ns6 = (!document.all && document.getElementById);


function promptDelete(myform)
{
	var agree = confirm("Are you sure you want to permanently delete this record from the database?");
	if (agree)
	{
		myform.delete_record.value = "true";
		return true;
	}
	else
		return false;
}

function redirectToUrl(strUrl)
{
	window.location.href = strUrl;
	return true;
}

function newWindow(strUrl, intWidth, intHeight, intResizable)
{
	var winProps = "width=" + intWidth + "px,height=" + intHeight + "px,scrollbars=1,resizable=" + intResizable + "top=50,left=50";
	window.open(strUrl, '', winProps);
	return false;
}
		
		
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 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.focus();
		result = false;
	}
   
  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 month = parseInt(elems[0],10);
 			var day = 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 MM/DD/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();		
		}
	} 
	
	return result;
}

function validateForm(theForm)
{
	// Customize these calls for your form

	// Start ------->
	
	//if (!validNum(theForm.duration,"Length of stay",true))
	//	return false;
		
	if (!validDate(theForm.start_date,"Start Date",true))
		return false;
		
	if (!validDate(theForm.end_date,"End Date",true))
		return false;

	
	// <--------- End
	
	return true;
}

function validateStepOne(strFormId)
{
	toggleDisplayMode('tblStep2','tblStep1');
}

function validateStepTwo(strFormId)
{
	var theForm = document.forms(strFormId);
	if (!validRequired(theForm.location_general,"Location (General)"))
		return false;
	
	if (!validRequired(theForm.location_specific,"Location (Specific)"))
		return false;

	if (!validRequired(theForm.desc_location,"Description of Location"))
		return false;	
		
	toggleDisplayMode('tblStep3','tblStep2');
}


function validateStepThree(strFormId)
{
	var theForm = document.forms(strFormId);
		
	if (!validRequired(theForm.desc_twoline,"Short Description"))
		return false;
	
	toggleDisplayMode('tblStep4','tblStep3');
}


function setDisplay(strID, obj, blnShow){
/****************************************************************************
Purpose:  Sets the style.display attribute of an object.
Inputs:   strID - a string id for the object
		  obj - a reference to the object itself; preferable to use this
		  blnShow - true if we want to show it, false to hide it
Outputs:  None
Results:  The object referred to by strID or obj is displayed or hidden
****************************************************************************/

	// if obj is not set, then use strID to get the object
	// document.getElementById is an expensive operation
	
	if (ns4)
	{
			if (!obj)
			obj = self.document.layers[strID];

	}
	else if (ie4)
	{
			if (!obj)
			obj = self.document.all[strID];

	}
	else if (ie5)
	{
		if (!obj)
			obj = self.document.getElementById(strID);
	}
	
	if (obj)
	{
		if (blnShow)
			obj.style.display = "block";
		else
			obj.style.display = "none";
	}
	
	
}



function toggleDisplayMode(strObjToShow, strObjToHide, blnShowBoth){
/****************************************************************************
Purpose:  Toggles the display mode for two objects or shows both
Inputs:   strObjToShow - the ID for the object to display
		  strObjToHide - the ID for the object to hide
		  blnShowBoth - true if we want to show both items
Outputs:  None
Results:  See purpose.
****************************************************************************/

	if (!blnShowBoth)
		setDisplay(strObjToHide, null, false);
	else
		setDisplay(strObjToHide, null, true);
		
	setDisplay(strObjToShow, null, true);
	
}