var iBoxWidth, iFSize;
iFSize = 26;

function writeTextField( fname, maxlen, fvalue, callfunc)
{
	if (iBPmix==4) {
		iBoxWidth = iFSize;
	} else {
		(isNS) ? iBoxWidth = iFSize/2 + 1 : iBoxWidth = iFSize;
	}
	return '<input type="text" name="' + fname + '" value="' + fvalue + '" size=' + iBoxWidth + ' maxlength=' + maxlen + ' class="formtxt" ' + callfunc + '>';
}

function writeTextArea( fname, maxlen, fvalue, callfunc)
{
	(isNS) || (isMoz) ? iBoxWidth = 19 : iBoxWidth = 24;
	return '<textarea name="' + fname + '" rows="5" cols="' + iBoxWidth + '" class="formtxt"></textarea>';
}

function writeHidden( fname, maxlen, fvalue, callfunc) {
	return '<input type="hidden" name="' + fname + '" value="' + fvalue + '">';
}

function emailCheck(thisControl)
{
	var emailStr = thisControl.value
	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)")
		thisControl.select()
  	thisControl.focus()
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]

	if (user.match(userPat)==null)
	{
		alert("The username doesn't seem to be valid.")
		thisControl.select()
  	thisControl.focus()
		return false
	}

	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null)
	{
		for (var i=1;i<=4;i++)
		{
			if (IPArray[i]>255)
			{
				alert("Destination IP address is invalid.")
				thisControl.select()
	 	 		thisControl.focus()
				return false				
			}
		}
		return true
	}

	var domainArray=domain.match(domainPat)
	if (domainArray==null)
	{
		alert("The domain name doesn't seem to be valid.")
		thisControl.select()
  	thisControl.focus()
		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.")
		thisControl.select()
  	thisControl.focus()
		return false
	}

	if (len<2)
	{
		var errStr="This address is missing a hostname!"
		alert(errStr)
		thisControl.select()
  	thisControl.focus()
		return false
	}
	return true;
}