//mouseover

	var imgDir = "images/";
	var imgExt = ".gif";
	var gazou = new Array(
		"topnavi_toi_on",
		"topnavi_toi_off",
		"topnavi_shozaichi_on",
		"topnavi_shozaichi_off",
		"topnavi_kyuujin_on",
		"topnavi_kyuujin_off",
		"topnavi_kaiin_on",
		"topnavi_kaiin_off"
	);
	
	var theImages = new Array();
	
	function preLoad()
	{
		for ( var i = 0; i < gazou.length; i++ ) {
			theImages[ i ] = new Image();
			theImages[ i ].src = imgDir + gazou[ i ] + imgExt;
		}
	}
	
	preLoad();
	
	function chgImg( imgObjName, imgName )
	{
		document.images[ imgObjName ].src = imgDir + imgName + imgExt;
	}