function validateContactUs() {
   if (	(document.contactus.firstName.value.length==0) ||
   	(document.contactus.firstName.value==null)) {
   	alert("Please enter First Name");
   	document.contactus.firstName.focus();
      return false;
   }
   
   if (	(document.contactus.lastName.value.length==0) ||
   	(document.contactus.lastName.value==null)) {
   	alert("Please enter Last Name");
   	document.contactus.lastName.focus();
      return false;
   }
   
   if (	(document.contactus.email.value.length==0) ||
   	(document.contactus.email.value==null)) {
   	alert("Please enter your email");
   	document.contactus.email.focus();
      return false;
   }

   if (	(document.contactus.enquiry.value.length==0) ||
   	(document.contactus.enquiry.value==null)) {
   	alert("Please enter your enquiry");
      return false;
   }
   
   if (	(document.contactus.security_code.value.length==0) ||
   	(document.contactus.security_code.value==null)) {
   	alert("Please enter the Security Code");
      return false;
   }

   return emailCheck(document.contactus.email.value);
}

function numbersOnly(event){
	if(window.event) // IE
	{
		keynum = event.keyCode
	} else if(event.which) // Netscape/Firefox/Opera
	{
		keynum = event.which
	}
	
	//space = 32, backspace=8
	if(keynum==8) return true;
	if ((keynum<48||keynum>57)) return false;
}

function numbersAndWhiteSpaceOnly(event){
	if(window.event) // IE
	{
		keynum = event.keyCode
	} else if(event.which) // Netscape/Firefox/Opera
	{
		keynum = event.which
	}
	
	//alert(keynum);
	//space = 32, backspace=8 
	if(keynum==8 || keynum == 32 || keynum== 39 || keynum == 37) return true;
	if ((keynum<48||keynum>57)) return false;
}

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 part of your email address before the '@' 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("Part of your email address after the '@' 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>6) {
	   // the address must end in a two letter or other TLD including museum
	   alert("The email address must end in a top level domain (e.g. .com), 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 got this far, everything's valid!
	return true;
}