function cht(Character) 
{
		var valid = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ. "
		var ok = "yes";
		var temp;
		for (var i=0; i<Character.length; i++) 
		{
		temp = "" + Character.substring(i, i+1);
		if (valid.indexOf(temp) == "-1") ok = "no";
		}
		if (ok == "no") 
		{
		alert("Invalid entry! Only characters are accepted!");
		return false;

	   }
	return true;
}