var requiredFields = new Array("txtName", "txtTitle", "txtCompany", "txtEmail", "txtPhone", "txtBudget", "txtMessage");
var fieldNames = new Array("Name", "Title", "Company", "Email", "Phone", "Budget", "Message");   
var FormOK = NameOK = TitleOK = CompanyOK = EmailOK = PhoneOK = BudgetOK = MessageOK = true;

function checkFields(input) {

	Source = (document.AForm.Source.selectedIndex)-0;
	if (Source == 0){
		if (document.AForm.Source.value == "") { alert("The 'Where did you hear about us?' field requires valid input"); return false;  }
	}

	if (document.AForm.txtMessage.value.length > 500){
		alert ("Your message can not exceed 500 characters."); return false;
	}
	
	if (!(checkRequiredFieldsBC(input))) {return false;}	
	if (!(NameOK)) { alert("The Name field requires valid input"); return false; }
	if (!(TitleOK)) { alert("The Title field requires valid input"); return false; }
	if (!(CompanyOK)) { alert("The Company field requires valid input"); return false; }
	if (!(EmailOK)) { alert("The Email field requires valid input"); return false; }
	if (!(PhoneOK)) { alert("The Phone field requires valid input"); return false; }
	if (!(BudgetOK)) { alert("The Budget field requires valid input"); return false; }
	if (!(MessageOK)) { alert("The Message field requires valid input"); return false; }
	else {
	return true; 
	}
}	
		
function checkRequiredFieldsBC(input)
{             
   
    var fieldCheck   = true;
    var fieldsNeeded = "\nA value must be entered in the following field(s):\n\n\t";

    for(var fieldNum=0; fieldNum < requiredFields.length; fieldNum++) {
        if ((input.elements[requiredFields[fieldNum]].value == "") ||
            (input.elements[requiredFields[fieldNum]].value == " ")) {

            fieldsNeeded += fieldNames[fieldNum] + "\n\t";
            fieldCheck = false;
        }
    }
  
    if (fieldCheck == true)
    {
		FormOK = true
        return true;
    }

    else
    {
		FormOK = false
        alert(fieldsNeeded);
        return false;
    }
}

// Check whether string s is empty.
function ifEmpty(s)
{   
	return ((s == null) || (s.length == 0))
}

// Returns true if string s is empty or 
// whitespace characters only.

function isWhitespace (s)
{   
	var i;
	var whitespace = " \t\n\r";
	
    // Is s empty?
    if (ifEmpty(s)) return true;

    // Search through string's characters one by one
    // until we find a non-whitespace character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++)
    {   
	// Check that current character isn't whitespace.
	var c = s.charAt(i);

	if (whitespace.indexOf(c) == -1) return false;
    }

    // All characters are whitespace.
    return true;
}

// isEmail (STRING s [, BOOLEAN emptyOK])
// 
// Email address must be of form a@b.c ... in other words:
// * there must be at least one character before the @
// * there must be at least one character before and after the .
// * the characters @ and . are both required
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.

function isEmail (s)
{   
	if (ifEmpty(s)) 
       if (isEmail.arguments.length == 1) return alert('Please Enter Email Address');
       else return (isEmail.arguments[1] == true);
   
    // is s whitespace?
    if (isWhitespace(s)) return alert('invalid email1'); //false;
    
    // there must be >= 1 character before @, so we
    // start looking at character position 1 
    // (i.e. second character)
    var i = 1;
    var sLength = s.length;

    // look for @
    while ((i < sLength) && (s.charAt(i) != "@"))
    { i++
    }

    if ((i >= sLength) || (s.charAt(i) != "@")) return alert('Invalid Email Address without  "@" '); //false;
    else i += 2;

    // look for .
    while ((i < sLength) && (s.charAt(i) != "."))
    { i++
    }

    // there must be at least one character after the .
    if ((i >= sLength - 1) || (s.charAt(i) != ".")) return alert('Invalid Email Address without  "." '); //false;
    else return true;
}		

function toNumber(checkString)
		{
			newString = ""; 	  //if not, then massage the numbers
			// LOOP THROUGH STRING CHARACTER BY CHARACTER
			for (i = 0; i < checkString.length; i++) {
				ch = checkString.substring(i, i+1);

			 // CHECKS TO SEE IF A NUMBER IS BETWEEN 0 AND 9, or - 
				if ((ch >="0"  && ch <= "9"))
				{
				 newString += ch;
				 }
				}
	
				return newString;
		}

/*  checking for valid Phone or Fax*/
function isPhoneFax(checkString) {
	//	check for incompatable characters
    for (i = 0; i < checkString.length; i++) {
        ch = checkString.substring(i, i+1);
		//if (!((ch >="0"  && ch <= "9") || (ch==" ") || (ch=="-") || (ch=="(") || (ch==")") || (ch=="x") ))
		if (!((ch >="0"  && ch <= "9") || (ch==" ") || (ch=="-") || (ch=="(") || (ch==")") || (ch=="x") ))
			{
				alert('This Phone number contains incompatable characters');
				document.AForm.txtPhone.clear;
				return(false);
			}
	}
	if (checkString.length >= 10 && checkString.length <=25)
		{
		return (true);
		}
	else 
		{ 
		alert('This Phone number is invalid'); 
		document.AForm.txtPhone.clear;
		return (false);
		}
}