(function($)
{
 $.fn.blink = function(options)
 {
 var defaults = { delay:500 };
 var options = $.extend(defaults, options);

 return this.each(function()
 {
 var obj = $(this);
 setInterval(function()
 {
 if($(obj).css("visibility") == "visible")
 {
 $(obj).css('visibility','hidden');
 }
 else
 {
 $(obj).css('visibility','visible');
 }
 }, options.delay);
 });
 }
}(jQuery))