function emailCheck(emailStr)
{
    /* 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]

    // See if "user" is valid 
    if (user.match(userPat) == null)
    {
	// user is not valid
	//alert("The username 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
    var domainArray = domain.match(domainPat)
    if (domainArray == null)
    {
	//alert("The domain name doesn't seem to be valid.")
	return false
    }

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

    /* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
    var atomPat = new RegExp(atom, "g")
    var domArr = domain.match(atomPat)
    var len = domArr.length
    if ((domArr[domArr.length-1].length < 2) ||
	(domArr[domArr.length-1].length > 3))
    {
	// the address must end in a two letter or three letter word.
	//alert("The address must end in a three-letter domain, or two letter country.")
	return false
    }

    // Make sure there's a host name preceding the domain.
    if (len < 2)
    {
	var errStr="This address is missing a hostname!"
	//alert(errStr)
	return false
    }

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

function ValidateForm(thisForm)
{
    if (thisForm.mailfrom.value == "")
    {
	alert("Please enter a value for your email address.") ;
	thisForm.mailfrom.focus() ;
	return false ;
    }
    else
    {
	if (!emailCheck(thisForm.mailfrom.value))
	{
	    alert("Please enter a valid e-mail address.") ;
	    thisForm.mailfrom.focus() ;
	    return false ;
	}
    }
 if (thisForm.Company_Name.value == "")
    {
	alert("Please enter a value for your Company Name.") ;
	thisForm.Company_Name.focus() ;
	return false ;
    }if (thisForm.Last_Name.value == "")
    {
	alert("Please enter a value for your Last Name.") ;
	thisForm.Last_Name.focus() ;
	return false ;
    }
  if (thisForm.First_Name.value == "")
    {
	alert("Please enter a value for your First Name.") ;
	thisForm.First_Name.focus() ;
	return false ;
    }
  if (thisForm.Street.value == "")
    {
	alert("Please enter a value for your Street.") ;
	thisForm.Street.focus() ;
	return false ;
    }
  if (thisForm.City.value == "")
    {
	alert("Please enter a value for your City.") ;
	thisForm.City.focus() ;
	return false ;
    }
  if (thisForm.State.value == "")
    {
	alert("Please enter a value for your State.") ;
	thisForm.State.focus() ;
	return false ;
    }
  if (thisForm.Zip.value == "")
    {
	alert("Please enter a value for your Zip.") ;
	thisForm.Zip.focus() ;
	return false ;
    }
  if (thisForm.Sales_Tax_ID.value == "")
    {
	alert("Please enter a value for your Sales Tax ID.") ;
	thisForm.Sales_Tax_ID.focus() ;
	return false ;
    }
/* there is no form field called Title to check	*/
/*
 if (thisForm.Title.value == "")
    {
	alert("Please enter a value for your Phone Number.") ;
	thisForm.Phone_Number.focus() ;
	return false ;
    }
 
*/ 
    return true ;
}