function emailCheck (emailStr) 
		{
				var checkTLD=1;

				/* The following is the list of known TLDs that an e-mail address must end with. */

				var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum|COM|NET|ORG|EDU|INT|MIL|GOV|ARPA|BIZ|AERO|NAME|COOP|INFO|PRO|MUSEUM)$/;

				/* 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 s 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];

				// Start by checking that only basic ASCII characters are in the strings (0-127).


				/*for (i=0; i<user.length; i++) {
					if(user.charCodeAt(i)>64 && user.charCodeAt(i)<91) {

					alert("Ths Email Id should contain small case letters only");
					return false;
					}
				}*/

				for (i=0; i<user.length; i++) {
					if((user.charCodeAt(i)>=33 && user.charCodeAt(i)<=47) && (user.charCodeAt(i)>=58 && user.charCodeAt(i)<=64) && (user.charCodeAt(i)>=91 && user.charCodeAt(i)<=94) && (user.charCodeAt(i)>=123 && user.charCodeAt(i)<=125))
					{
					
					alert("username contains special characters.");
					return false;
					}
				}

				for (i=0; i<domain.length; i++) {
					if (domain.charCodeAt(i)>127) {
					alert("The domain name contains special characters.");
					return false;
					}
				}

				// 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.  Check if it's valid.

				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) {
				alert("The domain name does not seem to be valid.");
				return false;
				   }
				}

				/* domain name seems valid, but now make sure that it ends in a
				known top-level domain (like com, edu, gov) or a two-letter word,
				representing country (uk, nl), and that there's a hostname preceding
				the domain or country. */

				if (checkTLD && domArr[domArr.length-1].length!=2 &&
				domArr[domArr.length-1].search(knownDomsPat)==-1) {
				alert("The address must end in a well-known domain or two letter " + "country.");
				return false;
				}

				// Make sure there's a host name preceding the domain.

				if (len<2) {
				alert("This address is missing a hostname!");
				return false;
				}

		return true;
	}