function wwlValid(str)
{
    var at="@"
    var dot="."
    var lat=str.indexOf(at)
    var lstr=str.length
    var ldot=str.indexOf(dot)
	
	if (str.indexOf(at)==-1)
	{
	   alert("Invalid Email address. Please try again.");
	   return false;
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)
	{
		alert("Invalid Email address. Please try again.");
		return false;
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
	{
		alert("Invalid Email address. Please try again.");
		return false;
	}

	if (str.indexOf(at,(lat+1))!=-1)
	{
		alert("Invalid Email address. Please try again.");
		return false;
	}

	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
	{
		alert("Invalid Email address. Please try again.");
		return false;
	}

	if (str.indexOf(dot,(lat+2))==-1)
	{
		alert("Invalid Email address. Please try again.");
		return false;
	}
		
	if (str.indexOf(" ")!=-1)
	{
		alert("Invalid Email address. Please try again.");
		return false;
	}

 	return true;
}