function isValidEmail(strEmail){
	  var validRegExp = /^[^@]+@[^@]+\.[a-z]{2,}$/i;
	
	  if (strEmail.search(validRegExp) == -1) {
		  return false;
		}
		return true;
	}

	
	function isPositiveInteger(str){
		var validRegExp = /^[0-9]{1,}$/;	//positive integers

		if (str.search(validRegExp) == -1) {
				return false;
		}
		return true;
	}	
	
	$(function() {
		$(".alert").live('change',function() {
			$(this).removeClass('alert');
		});
	});