function validateForm(thisform)
{
	if(thisform.taxid.value=='' || thisform.taxid.value.length < 9 || thisform.taxid.value.length > 9)
	{
		alert('Please enter a valid tax ID.');
		thisform.taxid.focus();
		return false;
	}

	if(!isInteger(thisform.tax_id.value))
	{
		alert('The tax ID field may only include numeric characters.  Please enter a valid tax ID.');
		thisform.tax_id.value = '';
		thisform.tax_id.focus();
		return false;
	}

	if(thisform.fname.value=='')
	{
		alert('Please tell us your first name.');
		thisform.fname.focus();
		return false;
	}
	if(thisform.fname.value.toLowerCase()=='first' || thisform.lname.value.toLowerCase()=='last')
	{
		alert('Your name appears to be invalid.  Please re-enter your name.');
		thisform.fname.focus();
		return false;
	}
	if(thisform.lname.value=='')
	{
		alert('Please tell us your last name.');
		thisform.lname.focus();
		return false;
	}
	if(thisform.email.value=='')
	{
		alert('Please enter an email address where you may be contacted.');
		thisform.email.focus();
		return false;
	}
	if(!emailCheck(thisform.email.value))
	{
		return false;
	}

	if(thisform.practice.value=='')
	{
		alert('Please provide us with the name of your organization.');
		thisform.practice.focus();
		return false;
	}
	//check to make sure they entered phone
	//number and that it is in the correct format

	if(thisform.phone.value=='')
	{
		alert('Please provide us with a valid phone number.');
		thisform.phone.focus();
		return false;
	}

	if(thisform.phone.value != '')
	{
		if(ValidatePhone(thisform.phone.value) == false)
		{
			alert("The phone number you have entered is not valid. Please enter a valid number.")
			thisform.phone.focus();
			return false;
		}
	}

	if(thisform.fax.value=='')
	{
		alert('Please provide us with a valid fax number.');
		thisform.fax.focus();
		return false;
	}

	if(thisform.fax.value != '')
	{
		if(ValidatePhone(thisform.fax.value) == false)
		{
			alert("The fax number you have entered is not valid. Please enter a valid number.")
			thisform.fax.focus();
			return false;
		}
	}

	if(thisform.address.value=='')
	{
		alert('Please provide us with your address.');
		thisform.address.focus();
		return false;
	}

	if(thisform.city.value=='')
	{
		alert('Please provide us with your city.');
		thisform.city.focus();
		return false;
	}
	if(thisform.state.selectedIndex==0)
	{
		alert('Please select your state from the drop-down.');
		thisform.state.focus();
		return false;
	}
	if(thisform.zip.value=='' || thisform.zip.value.length < 5)
	{
		alert('Please enter a valid zip code.');
		thisform.zip.focus();
		return false;
	}
	if(thisform.npi.value=='' || thisform.npi.value.length > 10 || thisform.npi.value.length < 10)
	{
		alert('Please enter a valid NPI.');
		thisform.npi.focus();
		return false;
	}
	if(!isInteger(thisform.npi.value))
	{
		alert('The NPI field may only include numeric characters.  Please enter a valid NPI.');
		thisform.npi.value = '';
		thisform.npi.focus();
		return false;
	}
}

function emailCheck (emailStr)
{
	if(emailStr != "")
	{
		/* The following variable tells the rest of the function whether or not
		to verify that the address ends in a two-letter country or well-known
		TLD.  1 means check it, 0 means don't. */

		var checkTLD=1;

		/* The following is the list of known TLDs that an e-mail address must end with. */

		var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

		/* The following pattern is used to check if the entered e-mail address
		fits the user@domain format.  It also is used to separate the username
		from the domain. */

		var emailPat=/^(.+)@(.+)$/;

		/* The following string represents the pattern for matching all special
		characters.  We don't want to allow special characters in the address.
		These characters include ( ) < > @ , ; : \ " . [ ] */

		var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";

		/* The following string represents the range of characters allowed in a
		username or domainname.  It really states which chars aren't allowed.*/

		var validChars="\[^\\s" + specialChars + "\]";

		/* The following pattern applies if the "user" is a quoted string (in
		which case, there are no rules about which characters are allowed
		and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
		is a legal e-mail address. */

		var quotedUser="(\"[^\"]*\")";

		/* The following pattern applies for domains that are IP addresses,
		rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
		e-mail address. NOTE: The square brackets are required. */

		var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

		/* The following string represents an atom (basically a series of non-special characters.) */

		var atom=validChars + '+';

		/* The following string represents one word in the typical username.
		For example, in john.doe@somewhere.com, john and doe are words.
		Basically, a word is either an atom or quoted string. */

		var word="(" + atom + "|" + quotedUser + ")";

		// The following pattern describes the structure of the user

		var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

		/* The following pattern describes the structure of a normal symbolic
		domain, as opposed to ipDomainPat, shown above. */

		var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

		/* Finally, let's start trying to figure out if the supplied address is valid. */

		/* Begin with the coarse pattern to simply break up user@domain into
		different pieces that are easy to analyze. */

		var matchArray=emailStr.match(emailPat);

		if (matchArray==null)
		{

			/* Too many/few @'s or something; basically, this address doesn't
			even fit the general mould of a valid e-mail address. */

			alert("Email address seems incorrect (check @ and .'s)");
			return false;
		}
		var user=matchArray[1];
		var domain=matchArray[2];

		// Start by checking that only basic ASCII characters are in the strings (0-127).

		for (i=0; i<user.length; i++)
		{
			if (user.charCodeAt(i)>127)
			{
				alert("The username of your email contains invalid characters.");
				return false;
			}
		}
		for (i=0; i<domain.length; i++)
		{
			if (domain.charCodeAt(i)>127)
			{
				alert("The domain name of your email contains invalid characters.");
				return false;
		    }
		}

		// See if "user" is valid

		if (user.match(userPat)==null)
		{
			// user is not valid

			alert("The username of your email doesn't seem to be valid.");
			return false;
		}

		/* if the e-mail address is at an IP address (as opposed to a symbolic
		host name) make sure the IP address is valid. */

		var IPArray=domain.match(ipDomainPat);
		if (IPArray!=null)
		{
			// this is an IP address

			for (var i=1;i<=4;i++)
			{
				if (IPArray[i]>255)
				{
					alert("Destination IP address is invalid!");
					return false;
				}
			}
			return true;
		}

		// Domain is symbolic name.  Check if it's valid.

		var atomPat=new RegExp("^" + atom + "$");
		var domArr=domain.split(".");
		var len=domArr.length;
		for (i=0;i<len;i++)
		{
			if (domArr[i].search(atomPat)==-1)
			{
				alert("The domain name of your email does not seem to be valid.");
				return false;
			}
		}

		/* domain name seems valid, but now make sure that it ends in a
		known top-level domain (like com, edu, gov) or a two-letter word,
		representing country (uk, nl), and that there's a hostname preceding
		the domain or country. */

		if (checkTLD && domArr[domArr.length-1].length!=2 &&
		domArr[domArr.length-1].search(knownDomsPat)==-1)
		{
			alert("The email address must end in a well-known domain or two letter " + "country.");
			return false;
		}

		// Make sure there's a host name preceding the domain.

		if (len<2)
		{
			alert("This email address is missing a hostname!");
			return false;
		}

		// If we've gotten this far, everything's valid!
		return true;
	}
}

// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";

// Maximum number of digits in a valid phone number.
var maxDigitsInPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag)
{   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++)
    {
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1)
        	returnString += c;
    }
    return returnString;
}

function wackyNumber(s)
{
	var area = s.substr(0,3);
	var prefix = s.substr(3,3);
	var lastfour = s.substr(6,4);
	var phnum = s.substr(3,7);
	var first_num = s.substr(3,1);
	var count = 0;

	for(x = 0; x < 7; x++)
	{
		if(phnum.charAt(x) == first_num)
		{
			count++;
		}
	}
	if(count == 7)
	{
		return false;
	}

	if(area == '000' || area == '123' || area == '111' || area == '222' || area == '333' || area == '444' || area == '555' || area == '666' || area == '777' || area == '999' || area == '911')
	{
		//alert('You have entered an invalid area code.');
		return false;
	}

	if(prefix == '555' || prefix == '000' || prefix == '911')
	{
		//alert('You have entered an invalid phone number prefix.');
		return false;
	}

	if(phnum == '456-7890' || phnum == '4567890' || phnum == '123-4567' || phnum == '1234567' || phnum == '456-7890' || phnum == '4567890')
	{
		//alert('You have entered an invalid phone number');
		return false;
	}

	if(prefix == area)
	{
		//alert('A phone number you entered seems to be invalid.  Please check your number and submit again.');
		return false;
	}
	return true;
}
function checkValidPhone(strPhone)
{
	s=stripCharsInBag(strPhone,phoneNumberDelimiters);
	return (isInteger(s) && wackyNumber(s) && s.length == maxDigitsInPhoneNumber);
}

function ValidatePhone(Phone)
{
	if (checkValidPhone(Phone)==false)
	{
		return false
	}
	else
		return true
}