function formValidator()
{
// set up array to hold error messages
this.errorList = new Array;
// set up object methods
this.isEmpty = isEmpty; 
this.isNumber = isNumber; 
this.isAlphabetic = isAlphabetic; 
this.isAlphaNumeric = isAlphaNumeric; 
this.isWithinRange = isWithinRange; 
this.isEmailAddress = isEmailAddress; 
this.isChecked = isChecked; 
this.raiseError = raiseError; 
this.numErrors = numErrors; 
this.displayErrors = displayErrors; 
}
// check to see if input is whitespace only or empty
function isEmpty(val)
{
if (val.match(/^s+$/) || val == "")
{
return true;
}
else
{
return false;
} 
}
// check to see if input is number
function isNumber(val)
{
if (isNaN(val))
{
return false;
}
else
{
return true;
} 
}
// check to see if input is alphabetic
function isAlphabetic(val)
{
if (val.match(/^[a-zA-Z]+$/))
{
return true;
}
else
{
return false;
} 
}
// check to see if input is alphanumeric
function isAlphaNumeric(val)
{
if (val.match(/^[a-zA-Z0-9]+$/))
{
return true;
}
else
{
return false;
} 
}
// check to see if value is within range
function isWithinRange(val, min, max)
{
if (val >= min && val <= max)
{
return true;
}
else
{
return false;
} 
}
// check to see if input is a valid email address


function isEmailAddress(val) {
	
		var str = val
		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    return false
		}
		if (str.indexOf(at,(lat+1))!=-1){
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    return false
		 }

 		 return true					
	}




//function isEmailAddress(val)
//{
//if (val.match(/^([a-zA-Z0-9])+
//([.a-zA-Z0-9_-])*@
//([a-zA-Z0-9_-])+
//(.[a-zA-Z0-9_-]+)+/)))
//{
//return true;
//}
//else
//{
//return false;
//} 
//}
// check to see if form value is checked
function isChecked(obj)
{
if (obj.checked)
{
return true;
}
else
{
return false;
} 
}
// display all errors
// iterate through error array and print each item
function displayErrors()
{
for (x=0; x<this.errorList.length; x++)
{
alert("Error: " + this.errorList[x]);
}
}
// add an error to error list
function raiseError(msg)
{
this.errorList[this.errorList.length] = msg;
}
// return number of errors in error array
function numErrors()
{
return this.errorList.length;
}