jQuery.noConflict();

function addEventHandler(selector, speed, opacityOut, opacityOver) {
	jQuery(selector).fadeTo(speed,opacityOut);
	
	jQuery(selector).mouseover(function(event){
		jQuery(this).fadeTo(speed, opacityOver);
	});
	
	jQuery(selector).mouseout(function(event){
		jQuery(this).fadeTo(speed, opacityOut);
	});
}

jQuery(document).ready(function(){
	var selector = ".jroll img";
	//セレクタ（適用タグ）、スピード、初期透明度、オーバー時透明度
	addEventHandler(selector, 200, 1, 0.4);
});