function checkEmail (emailStr,errorMsg, needFlag) {
			var eStr=emailStr.value;
			var emailvalue=eStr.toLowerCase();
			var checkTLD=1;
			var knownDomsPat=/^(com|net|org|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 +")*$");
			var matchArray=emailvalue.match(emailPat);
			if (matchArray==null) {
			alert("Email address seems incorrect (check @ and .'s)");
			return false;
			}
			var user=matchArray[1];
			var domain=matchArray[2];
			for (i=0; i<user.length; i++) {
			if (user.charCodeAt(i)>127) {
			//alert("Ths username contains invalid characters.");
			alert("Email address seems incorrect (check @ and .'s)");
			return false;
			   }
			}
			for (i=0; i<domain.length; i++) {
			if (domain.charCodeAt(i)>127) {
			alert("Ths domain name contains invalid characters.");
			return false;
			   }
			}
			if (user.match(userPat)==null) {
			alert("Email address seems incorrect (check @ and .'s)");
			return false;
			}
			var IPArray=domain.match(ipDomainPat);
			if (IPArray!=null) {
			for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
			alert("Destination IP address is invalid!");
			return false;
			   }
			}
			return true;
			}
			var atomPat=new RegExp("^" + atom + "$");
			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;
			   }
			}
			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;
			}
			if (len<2) {
			alert("This address is missing a hostname!");
			return false;
			}
			return true;
}

function checkEmailIndex (emailStr,errorMsg, needFlag) {
	checkEmail(emailStr,errorMsg, needFlag);
}