/* マウスアウト時に表示する画像URLを指定 */
var sideNavbackGifFileUrl = 'url(img/item/sideNav_back_projectcase.gif)';

/* マウスオーバー時に表示する画像URLを指定 */
var sideNavbackOverGifFileUrl= 'url(img/item/sideNav_back_over_projectcase.gif)';

$(document).ready(function() {
	    $("#sideNav_list div") .mouseover(
	    	function() {
	    		switch(this.className) {
	    			case "off":
						this.style.backgroundImage = sideNavbackOverGifFileUrl;
	    				break;
	    			case "suboff":
	    				this.style.backgroundImage = sideNavbackOverSubGifFileUrl;
	    				break;
	    		} 
			}
	    )

		 .mouseout(
		    function() {
		    	if(this.className != "on" && this.className != "subon") {
			    	switch(this.className) {
			    		case "off":
							this.style.backgroundImage = sideNavbackGifFileUrl;
							break;
			    		case "suboff":
			    			this.style.backgroundImage = sideNavbackSubGifFileUrl;
			    			break;
			    	}
			    }
			}
		)
	}
);