var phone_field_length=0;

function TabNext(obj,event,len,next_field) {
    if (event == "down") {
        phone_field_length=obj.value.length;
        }
    else if (event == "up") {
    if (obj.value.length != phone_field_length) {
        phone_field_length=obj.value.length;
        if (phone_field_length == len) {
            next_field.focus();
            }
        }
    }
}

    
function isDate(varDateToCheck) {
    
    var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{4})$/;
    
    /* is the format ik? */
    var matchArray = varDateToCheck.match(datePat); 
    
    if (matchArray == null) 
    {
        return false;
    }	
    month = matchArray[1]; // parse date into variables
    day = matchArray[3];
    year = matchArray[4];
    
    /* check month range */
    if (month < 1 || month > 12) 
    {
        return false;
    }
    if (day < 1 || day > 31) 
    {
        return false;
    }
    if ((month==4 || month==6 || month==9 || month==11) && day==31) 
    {
        return false;
    }
    if (month == 2) 
    { // check for february 29th
        var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
        if (day>29 || (day==29 && !isleap)) 
        {
            return false;
        }
    }
    return true;		
}

function IsNumNumeric(sText)
{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
   }

function IsAlphaNumeric(sText)
{
   var ValidChars = "-0123456789.ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz%$&@* ";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
}


function isValidCreditCard(number) {
    var total = 0;
    var flag = 0;
    for (var i=(number.length - 1);i>=0; i--) {
        if (flag == 1) {
            var digits = number.charAt(i) * 2;
            if (digits > 9) digits -= 9;
            total += digits;
            flag = 0;
        } else {
            total = total + parseInt(number.charAt(i));
            flag = 1;
        }
    }
    if ((total%10) == 0) {
        return true;
    } else {
        return false;
    }
}


function isValidEmail(emailStrIn) {

    /* The following variable tells the rest of the function whether or not
    to verify that the address ends in a two-letter country or well-known
    TLD.  1 means check it, 0 means don't. */

    var emailStr = emailStrIn.toLowerCase();

    var checkTLD=1;

    var knownDomsPat=/^(com|net|org|us|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) {

        return false;
    }

    var user=matchArray[1];
    var domain=matchArray[2];

    for (i=0; i<user.length; i++) {
        if (user.charCodeAt(i)>127) {
            return false;
        }
    }

    for (i=0; i<domain.length; i++) {
        if (domain.charCodeAt(i)>127) {
            return false;
        }
    }

    if (user.match(userPat)==null) {

        return false;
    }

    var IPArray=domain.match(ipDomainPat);

    if (IPArray!=null) {

        for (var i=1;i<=4;i++) {
            if (IPArray[i]>255) {
                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) {
            return false;
        }
    }

    if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
        return false;
    }

    if (len<2) {
        return false;
    }

    return true;

}


function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pw_menu_02_over = newImage("/images/menu/pw_menu_02-over.jpg");
		pw_menu_03_over = newImage("/images/menu/pw_menu_03-over.jpg");
		pw_menu_04_over = newImage("/images/menu/pw_menu_04-over.jpg");
		pw_menu_05_over = newImage("/images/menu/pw_menu_05-over.jpg");
		pw_menu_06_over = newImage("/images/menu/pw_menu_06-over.jpg");
		pw_menu_07_over = newImage("/images/menu/pw_menu_07-over.jpg");
		pw_menu_08_over = newImage("/images/menu/pw_menu_08-over.jpg");
		pw_menu_09_over = newImage("/images/menu/pw_menu_09-over.jpg");
		preloadFlag = true;
	}
}