function check_email(e) {

ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM";



	for(i=0; i < e.length ;i++){

		if(ok.indexOf(e.charAt(i))<0){ 

			return (false);

		}	

	} 



	if (document.images) {

 re_two = /^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;

                
                return re_two.test(e);

	}

}
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 E-mail address is missing a hostname!"
	   alert(errStr)
	   return false

	   }
	   // If we've gotten this far, everything's valid!
	return true
}
function isEmpty(s)

{  

	return ((s == null) || (s.length == 0) || (s.substr(0,1) == " "))

}

function check_form(f) { // f is the form (passed using the this keyword)

	if(f.name.value.length < 1){

		alert("You entered less than one character in the name field.");

		f.name.focus(); // put the prompt in the name field 

		// if the browser is Netscape 6 or IE

		if(document.all || document.getElementByID){

		// change the color of text field

		f.name.style.background = "yellow";

		}

		// make sure the form is not submitted

		return false;

	}



	// check the first email address ( the exclamation means "not" )

	if(!check_email(f.email.value)){

		alert("Invalid email detected.");

		f.email.focus(); 

		// if the browser is Netscape 6 or IE

		if(document.all || document.getElementByID){

			// change the color of text field

			f.email.style.background = "yellow";

		}

	// make sure the form is not submitted

	return false;

	}

	

	// check the second email address

	if(!check_email(f.another_email.value)){

		alert("Invalid email detected.");

		f.another_email.focus(); 

		if(document.all || document.getElementByID){

		f.another_email.style.background = "yellow";

		}

		return false;

	}

}

function IsInteger(snum)

{

	var reInteger = /^\d+$/

    return reInteger.test(snum)

}

function openWin(windowURL, windowName, windowFeatures){ 

	return window.open(windowURL, windowName, windowFeatures); 

}

function IsNumeric(strString)
   //  check for valid numeric strings	
   {
   var strValidChars = "0123456789.-";
   var strChar;
   var blnResult = true;

   if (strString.length == 0) return false;

   //  test strString consists of valid characters listed above
   for (i = 0; i < strString.length && blnResult == true; i++)
      {
      strChar = strString.charAt(i);
      if (strValidChars.indexOf(strChar) == -1)
         {
         blnResult = false;
         }
      }
   return blnResult;
   }


function IsValidName(str){
	
		var nameExp = "^[a-zA-Z'-0-9 .\s%]{1,40}$";
	
		return str.match(nameExp);
}

function IsValidDesc(str){
	
		var descExp = "^[a-zA-Z-0-9 ',:&;.\s%]{1,2000}$";
	
		return str.match(descExp);
}
function IsValidPhone(str){
	
		var descExp = "^[0-9\s]{1,40}$";
	
		return str.match(descExp);
}