// form validation functions ---------------------------------------------------

// function to check if a character is considered whitespace or not
// (includes invisible characters like tabs and line breaks)
function isWhite(c)
{
	return ((c == "\t") || (c == " "));
}

// function that strips all the whitespace off a string
function trim(s)
{
	var i, j = s.length;

	for (i = 0; isWhite(s.charAt(i)) && (i < j); i++)
		;
	if (i == j) return ""; //whole string is white
	for (; isWhite(s.charAt(j-1)); j--)
		;
	return s.substring(i, j);
}

// given the reference to a radio button group, returns the string
// value of the checked radio button
function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}

// returns true if an email has valid syntax
function checkEmail (emailStr) {
	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	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 +")*$");
	var matchArray=emailStr.match(emailPat);
	if (matchArray==null) {
//	alert("Email address seems incorrect (check @ and .s)");
	return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	for (i=0; i<user.length; i++) {
	if (user.charCodeAt(i)>127) {
	//alert("Ths username contains invalid characters.");
	return false;
	   }
	}
	for (i=0; i<domain.length; i++) {
	if (domain.charCodeAt(i)>127) {
	//alert("Ths domain name contains invalid characters.");
	return false;
	   }
	}
	if (user.match(userPat)==null) {
	//alert("The username does not seem to be valid.");
	return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
	for (var i=1;i<=4;i++) {
	if (IPArray[i]>255) {
	//alert("Destination IP address is invalid!");
	return false;
	   }
	}
	return true;
	}
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
	if (domArr[i].search(atomPat)==-1) {
	//alert("The domain name does not seem to be valid.");
	return false;
	   }
	}
	if (checkTLD && domArr[domArr.length-1].length!=2 && 
	domArr[domArr.length-1].search(knownDomsPat)==-1) {
	//alert("The address must end in a well-known domain or two letter " + "country.");
	return false;
	}
	if (len<2) {
	//alert("This address is missing a hostname!");
	return false;
	}
	return true;
}

function validatePosInteger( strValue ) {
/************************************************
DESCRIPTION: Validates that a string contains only
    valid integer number. **/
  var objRegExp  = /(^\d\d*$)/;

  //check for integer characters
  return objRegExp.test(strValue);
}


// end form validation functions -----------------------------------------------