function IsValidEmail( emailStr )
	{
		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]	
		
		if (user.match(userPat)==null) {return false}
		
		var IPArray=domain.match(ipDomainPat)
		
		if (IPArray!=null) 
		{
			// this is an IP address
			for (var i=1;i<=4;i++) 
			{
				if (IPArray[i]>255){return false}
			}		
			return true
		}
		
		var domainArray=domain.match(domainPat)
		
		if (domainArray==null) {return false}	
		
		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) {	return false}
		
		// Make sure there's a host name preceding the domain.
		if (len<2) {return false}
		
		return true;
	}