$(document).ready(function($) {
	
	function opacity()
	{
		$(".img_op").css("opacity","0.9");
		$(".img_op").hover(function ()
		{
			$(this).stop().animate(
			{opacity: 1.0},
			"fast"
			);
		},

		function ()
		{
			$(this).stop().animate(
			{opacity: 0.9},
			"fast"
			);
		}
	
		);

	};
	
	opacity();
	
	
});