//<!--
// eliminate the left and right spaces from the string.
function Trim(string) {
	var i;
	var intCount;
	
	intCount = 0;
	for (i = 0; i < string.length; i++) 
		if ((string.charAt(i)) != " ") 
			break;
		else 
			intCount = intCount + 1;
		
	string = string.substring(intCount, string.length);
	
	intCount = 0;
	for (i = string.length-1; i >= 0; i--) 
		if ((string.charAt(i)) != " ") 
			break;
		else 
			intCount = intCount + 1;
		
	string = string.substring(0, string.length-intCount);	
	return string;		
}

//  Returns true if strNum  is a number
function isNumeric( strNum ) {
	var intCounter=0 , intLoop;

	strNum = Trim(strNum);
	if (strNum == '') return false; // Not number
	if (strNum == '.') return false; // Not number

	for (intLoop = 0; intLoop < strNum.length; intLoop++) { // One . only
		if (strNum.charAt(intLoop) == ".") intCounter++;
		if (intCounter > 1) return false;
	}

	for (intLoop = 0; intLoop < strNum.length; intLoop++) { // 0-9, . only
		if (((strNum.charAt(intLoop) < "0") || (strNum.charAt(intLoop) > "9")) && 
				(strNum.charAt(intLoop) != ".")	)
			return false;
	}
	return true; // value is 0
}

function DateValid(intDay, intMonth, intYear) {
	var arrMonthDays = new Array ("31", "29", "31",	"30", "31", "30",
											"31", "31", "30",	"31","30","31"	  );
	var intCount;
	if ((!isNumeric(intDay)) || (!isNumeric(intMonth)) || (!isNumeric(intYear))) return false;
	if ((intYear==0) || (intYear.length != 4)) return false;
   if ((intMonth>12) || (intMonth<=0)) return false;
	if ((parseFloat(intDay) > parseFloat(arrMonthDays[intMonth-1])) || (parseFloat(intDay)<=0) ) {
		return false;
	}
	if ((intMonth==2) && (intDay==arrMonthDays[1]) && (intYear%4>0) ) {
		 //"The end of this month is 28"
	    return false;
	}
	return  true;
}

//Returns client-side date
function writedate(){
	var now = new Date();
	var days = new Array(6);
	var months = new Array(11);
	var day = now.getDay();
	var dd = now.getDate();
	var mm = now.getMonth();
	var yy = now.getFullYear();
	var str;
	days[0] = "Monday, ";
	days[1] = "Tuesday, ";
	days[2] = "Wednesday, ";
	days[3] = "Thursday, ";
	days[4] = "Friday, ";
	days[5] = "Saturday, ";
	days[6] = "Sunday, "

	months[0] = "January ";
	months[1] = "February ";
	months[2] = "March ";
	months[3] = "April ";
	months[4] = "May ";
	months[5] = "June ";
	months[6] = "July ";
	months[7] = "August ";
	months[8] = "September ";
	months[9] = "October ";
	months[10] = "November ";
	months[11] = "December ";
	str = days[day-1] + months[mm] + dd + ", " + yy;
	document.write(str);
}

//  Returns true if strNum  is alphanumeric
function isAlphaNum( strNum ) {

	var intLoop, strUNum;
    
	strUNum= strNum.toUpperCase();
	for (intLoop = 0; intLoop < strUNum.length; intLoop++) { 
		if ((((strUNum.charAt(intLoop) < "A") || (strUNum.charAt(intLoop) > "Z")) &&
			 ((strUNum.charAt(intLoop) < "0") || (strUNum.charAt(intLoop) > "9")))
		      && (strUNum.charAt(intLoop) != " "))
			return false;
	}
	return true;
}

function emailCheck (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
	}
	var user=matchArray[1]
	var domain=matchArray[2]

	if (user.match(userPat)==null) {
	    alert("The username doesn't 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 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
	}

	return true;
}

// -->