function isValidEmail (emailStr) 
	{
		
		var emailPat=/^(.+)@(.+)$/
		var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
		var validChars="\[^\\s" + specialChars + "\]"
		var quotedUser="(\"[^\"]*\")"
		var ipDomainPat=/^\[(\d{1,4})\.(\d{1,4})\.(\d{1,4})\.(\d{1,4})\]$/
		var atom=validChars + '+'
		var word="(" + atom + "|" + quotedUser + ")"
		var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
		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;
		}

		// 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>4) {   
			alert("The address must end in a four-letter domain, 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 IsNumeric(sText)
	{
		var ValidChars = "0123456789.";
		var IsNumber   = true;
		var Char;
	
		for (i = 0; i < sText.length && IsNumber == true; i++) 
		{ 
			Char = sText.charAt(i); 
			if ((i == 0) && (Char == "-")) { 	// check first character for minus sign
				IsNumber = false;
			}	
			else if (ValidChars.indexOf(Char) == -1) IsNumber = false;
		}
		return IsNumber;
	}
	
	function IsInteger(sText)
	{
		var ValidChars = "0123456789";
		var IsNumber   = true;
		var Char;
	
		for (i = 0; i < sText.length && IsNumber == true; i++) 
		{ 
			Char = sText.charAt(i); 
			if ((i == 0) && (Char == "-")) { 	// check first character for minus sign
				IsNumber = false;
			}	
			else if (ValidChars.indexOf(Char) == -1) IsNumber = false;
		}
		return IsNumber;
	}
	
	//-- Declaring valid date character, minimum year and maximum year
    var dtCh= "/";
    var minYear=1900;
    var maxYear=2100;

    function stripCharsInBag(s, bag){
    	var i;
        var returnString = "";
        // Search through string's characters one by one.
        // If character is not in bag, append to returnString.
        for (i = 0; i < s.length; i++){   
            var c = s.charAt(i);
            if (bag.indexOf(c) == -1) returnString += c;
        }
        return returnString;
    }
    
    function daysInFebruary (year){
    	// February has 29 days in any year evenly divisible by four,
        // EXCEPT for centurial years which are not also divisible by 400.
        return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
    }
    function DaysArray(n) {
    	for (var i = 1; i <= n; i++) {
    		this[i] = 31
    		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
    		if (i==2) {this[i] = 29}
       } 
       return this
    }
    
    function isValidDate(dtStr){
    	var daysInMonth = DaysArray(12)
    	var pos1=dtStr.indexOf(dtCh)
    	var pos2=dtStr.indexOf(dtCh,pos1+1)
    	var strMonth=dtStr.substring(0,pos1)
    	var strDay=dtStr.substring(pos1+1,pos2)
    	var strYear=dtStr.substring(pos2+1)
    	strYr=strYear
    	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
    	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
    	for (var i = 1; i <= 3; i++) {
    		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
    	}
    	month=parseInt(strMonth)
    	day=parseInt(strDay)
    	year=parseInt(strYr)
    	if (pos1==-1 || pos2==-1){
    		alert("The date format should be : mm/dd/yyyy")
    		return false
    	}
    	if (strMonth.length<1 || month<1 || month>12){
    		alert("Please enter a valid month")
    		return false
    	}
    	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
    		alert("Please enter a valid day")
    		return false
    	}
    	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
    		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
    		return false
    	}
    	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || IsInteger(stripCharsInBag(dtStr, dtCh))==false){
    		alert("Please enter a valid date")
    		return false
    	}
        return true
    }