function BturnOn(imageName,swapImg) {
  if (document.images) { document [imageName + swapImg].src = eval("b" + imageName + "1.src"); }
}

function BturnOff(imageName,swapImg) {
  if (document.images) { document [imageName + swapImg].src = eval("b" + imageName + "0.src"); }
}

if (document.images) {
  NAVarr = new Array("home","about","work","people","careers","sitemap","help", "contact");
  for (var NAVitem in NAVarr) {
    for (var NAVicount=0; NAVicount < 2; NAVicount++) {
      eval("b" + NAVarr[NAVitem] + NAVicount + " = new Image()");
      eval("b" + NAVarr[NAVitem] +  NAVicount + ".src = '../../images/swap_" + NAVarr[NAVitem] + NAVicount + ".gif'");
    }
  }
}

function validateName (nameStr) {
	if (nameStr.length < 2) {
		alert("Please put your full name in the name field.")
		return false
	}
	return true
}

function validateEmail (emailStr) {
	
	var emailPat=/^(.+)@(.+)$/
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
	var validChars="\[^\\s" + specialChars + "\]"
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	var atom=validChars + '+'
	var word="(" + atom + "|" + quotedUser + ")"
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
	
	var matchArray=emailStr.match(emailPat)
	if (matchArray==null) {
		alert("Email address seems incorrect (check @ and .'s)")
		return false
	}
	else {
		
		var user=matchArray[1];
		var domain=matchArray[2];
		
		// See if "user" is valid 
		if (user.match(userPat)==null) {
			alert("The username doesn't seem to be valid.")
			return false
		}
		
		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
				}
			}
		}
		
		// Domain is symbolic name
		var domainArray=domain.match(domainPat)
		if (domainArray==null) {
			alert("The domain name doesn't seem to be valid.")
			return false
		}
		
		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) {
			alert("The address must end in a three-letter domain, or two letter country.")
			return false
		}
		
		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 validateSubscribeForm(detailsForm) {
	if (!validateName(detailsForm.sendername.value)) {
		detailsForm.sendername.focus()
		detailsForm.sendername.select()
		return false
	} 
	else if (!validateEmail(detailsForm.senderemail.value)) {
		detailsForm.senderemail.focus()
		detailsForm.senderemail.select()
		return false
	}
	
	return true
}

function validateReferForm(detailsForm) {
	if (!validateName(detailsForm.referredname.value)) {
		detailsForm.referredname.focus()
		detailsForm.referredname.select()
		return false
	} else if (!validateEmail(detailsForm.referredemail.value)) {
		detailsForm.referredemail.focus()
		detailsForm.referredemail.select()
		return false
	} else if (!validateName(detailsForm.referrername.value)) {
		detailsForm.referrername.focus()
		detailsForm.referrername.select()
		return false
	} else if (!validateEmail(detailsForm.referreremail.value)) {
		detailsForm.referreremail.focus()
		detailsForm.referreremail.select()
		return false
	}
	
	return true
}