function fChkEmpty(sVal){
	if(sVal == ''){
		return true;
	} else {
		return false;
	}
}
function fChkOverMax(sVal, iMax){
	if(sVal.length > iMax){
		return true;
	} else {
		return false;
	}
}
function fChkUnderMin(sVal, iMin){
	if(sVal.length < iMin){
		return true;
	} else {
		return false;
	}
}
function fChkCompare(s1, s2){
	if(s1 == s2){
		return true;
	} else {
		return false;
	}
}

function fChkNumeric(sVal, bInteger, bNegative){
	var re;
	if(bInteger){
		re = /^\d*$/;
		if(bNegative){
			re = /^(-\d)?\d*$/;
		}
	} else {
		re = /^\d*(\.\d+)?$/;
		if(bNegative){
			re = /^(-\d)?\d*(\.\d+)?$/;
		}
	}
	if(sVal.search(re) == -1){
		return false;
	} else {
		return true;
	}
}

function ChkInNumericRange(sVal, iRangeLeft, iRangeRight){
	if(sVal >= iRangeLeft && sVal <= iRangeRight){
		return true;
	} else {
		return false;
	}
}


function fChkInCharList(sVal, sCharList){
	var bIsInCharList = true;
	var q;
	for(q=0; q<sVal.length && bIsInCharList == true; q++){
		//alert('sVal.charAt(' + q + ') = ' + sVal.charAt(q));
		if(sCharList.indexOf(sVal.charAt(q)) == -1){
			bIsInCharList = false;
		}
	}
	return bIsInCharList;
}

function fChkEmail(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<1 || 
	    domArr[domArr.length-1].length>5) {
	   // the address must end in a one through five letter word.
//	   alert("The address must end in a proper domain.");
	   return false;
	}

	// Make sure there's a host name preceding the domain.
	if (len<2) {
	   var errStr = sMissingHostName + "\n";
//	   alert(errStr);
	   return false;
	}

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