// Input	: emailStr (email string to evaluate)
	// Output	: true 	-> if email has correct format
	//		  false	-> if email has wrong format
	// Purpose	: to validate an email format
	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) {
      			for (var i=1;i<=4;i++) {
	    			if (IPArray[i]>255) {
					return false;
	    			}
	  		}
	  		return true;
		}

		// Domain is symbolic name
		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;
		}

		if (len<2) {
			//alert(errStr);
			return false;
		}

		// If we've gotten this far, everything's valid!
		return true;
  	}