function initRollOverImages() {  
	var image_cache = new Object();  
		$("a img.over , input.over , .over a img").not("[src*='_over.']").each(function(i) {  
			var imgsrc = this.src;  
			var dot = this.src.lastIndexOf('.');  
			var imgsrc_over = this.src.substr(0, dot) + '_over' + this.src.substr(dot, 4);  
			image_cache[this.src] = new Image();  
			image_cache[this.src].src = imgsrc_over;  
			$(this).hover(  
				function() { this.src = imgsrc_over; },  
				function() { this.src = imgsrc; }  
				);  
		});  
	}  
$(document).ready(initRollOverImages);  

//ドロップダウンメニュー用
$(function() {
	$('#nav ul').droppy({speed: 100});
});

//画像切り替え
function gazou(mySrc){
	document.myimg.src=mySrc;
}