$(document).ready(function(){
    $("img.linkOn").each(function() {
        var off = this.src;
        var dot = this.src.lastIndexOf('.');
        var on = this.src.substr(0, dot) +
            '_on' + this.src.substr(dot, 4);
        $(this).hover(
            function() { this.src = on; },
            function() { this.src = off; });
    });
});
/* linOpa */
(function($) {
	
	$.fn.opOver = function(op,oa,durationp,durationa){
		
		var c = {
			op:op? op:1.0,
			oa:oa? oa:0.6,
			durationp:durationp? durationp:'fast',
			durationa:durationa? durationa:'fast'
		};
		

		$(this).each(function(){
			$(this).css({
					opacity: c.op,
					filter: "alpha(opacity="+c.op*100+")"
				}).hover(function(){
					$(this).fadeTo(c.durationp,c.oa);
				},function(){
					$(this).fadeTo(c.durationa,c.op);
				})
		});
	}
	
	
})(jQuery);

(function($) {
	$(function() {
	  $('.linkOpa').opOver(1.0,0.8,100);
	});
})(jQuery);