function emailCheck (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<2 || 
	    domArr[domArr.length-1].length>3) {
	   // the address must end in a two letter or three letter word.
	   //alert("The address must end in a three-letter domain, or two letter country.")
	   return false
	}
	
	// Make sure there's a host name preceding the domain.
	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 validEmail(elem) {
	if (!emailCheck(elem.value)) {
		return false;
	}
	return true;
}
function validTextbox(elem, mini) {
	if (elem.value.length < mini) {
		return false;
	}
	return true;
}
function validPhoneNumber(s) {
	if (s == "") {
		return false;
	}
	var m = new String(s); 
    m = m.replace(/[()+-]/, '');
    if (m.length < 6) {
    	return false;
    }
    if (m.length > 18) {
    	return false;
    }
    if (!isInteger(m)) {
    	return false;
    }
    return true;
}
function validPernum(s) {
	if (s == "") {
		return false;
	}
	var m = new String(s); 
    m = m.replace(/[()+-]/, '');
    if (!isInteger(m)) {
    	return false;
    }
    if (m.length < 6) {
    	return false;
    }
    return true;
}
function validCardnum(s) {
	if (s == "") {
		return false;
	}
	var m = new String(s); 
    m = m.replace(/[()+-]/, '');
    if (!isInteger(m)) {
    	return false;
    }
    if (m.length > 16) {
    	return false;
    }
    if (m.length < 8) {
    	return false;
    }
    return true;
}
function validCVV(s) {
	if (s == "") {
		return false;
	}
	var m = new String(s); 
    m = m.replace(/[()+-]/, '');
    if (!isInteger(m)) {
    	return false;
    }
    if (m.length > 3) {
    	return false;
    }
    if (m.length < 3) {
    	return false;
    }
    return true;
}
function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}
function validateCF() {
	var valid = true;
	var fname = document.getElementById("c_fname");
	var lname = document.getElementById("c_lname");
	var phone = document.getElementById("c_phone");
	var email = document.getElementById("c_email");
	var error = ""
	if (!validTextbox(fname,2)) {
		error = error + "אנא מלא שם פרטי\n";
		valid = false;
	}
	if (!validTextbox(lname,2)) {
		error = error + "אנא מלא שם משפחה\n";
		valid = false;
	}
	if (!validTextbox(phone,7)) {
		error = error + "אנא מלא טלפון\n";
		valid = false;
	}
	if (!validEmail(email)) {
		error = error + "אנא מלא כתובת דוא\"ל תקינה\n";
		valid = false;
	}
	if (error != "") {
		alert (error);
	}
	return valid;
}
function removeSymbsCD() {
	var elem = document.getElementById("CardNum");
	var m = new String(elem.value); 
    m = m.replace(/[()+-]/g, '');
    m = m.replace(/[ ]/g, '');
    document.getElementById("CardNum").value = m;
}
function validateOF() {
	var fname = document.getElementById("o_pd_fname");
	var lname = document.getElementById("o_pd_lname");
	var email = document.getElementById("Email");
	var phone = document.getElementById("PhoneNumber");
	var street = document.getElementById("o_sd_street");
	var house = document.getElementById("o_sd_house");
	var city = document.getElementById("BillingCity");
	var zip = document.getElementById("BillingZipCode");
	var member = document.getElementById("Member");
	var pnum = document.getElementById("PersonalNum");
	var cnum = document.getElementById("CardNum");
	var cvv2 = document.getElementById("CVV2");
	error = "";
	valid = true;
	if (!validTextbox(fname,2)) {
		error = error + "אנא מלא שם פרטי\n";
		valid = false;
	}
	if (!validTextbox(lname,2)) {
		error = error + "אנא מלא שם משפחה\n";
		valid = false;
	}
	if (!validEmail(email)) {
		error = error + "אנא מלא כתובת דוא\"ל תקינה\n";
		valid = false;
	}
	if ((!validPhoneNumber(phone.value))) {
		error = error + "אנא מלא מספר טלפון תקין\n";
		valid = false;
	}
	if (!validTextbox(street,2)) {
		error = error + "אנא מלא רחוב\n";
		valid = false;
	}
	if (!validTextbox(house,1)) {
		error = error + "אנא מלא בית\n";
		valid = false;
	}
	if (!validTextbox(city,2)) {
		error = error + "אנא מלא עיר\n";
		valid = false;
	}
	if ((!validTextbox(zip,4)) || (!isInteger(zip.value))) {
		error = error + "אנא מלא מספר מיקוד תקין\n";
		valid = false;
	}
	if (!validTextbox(member,5)) {
		error = error + "אנא מלא שם בעל הכרטיס\n";
		valid = false;
	}
	if (!validPernum(pnum.value)) {
		error = error + "אנא מלא מספר תעודת זיהוי\n";
		valid = false;
	}
	if (!validCardnum(cnum.value)) {
		error = error + "אנא מלא מספר כרטיס אשראי\n";
		valid = false;
	}
	if (!validCVV(cvv2.value)) {
		error = error + "אנא מלא מספר CVV\n";
		valid = false;
	}
	if (error != "") {
		alert (error);
	}
	return valid;
}