function emailCheck (emailStr)
	{
		var checkTLD=1;
		var knownDomsPat=/^(com|net|org|edu|int|mil|web|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;
	}